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ANSWER

If S7=49 and S17=289 then find Sum of n terms.

Posted by Saket S 6 years, 3 months ago

CBSE > Class 10 > Mathematics

1 answers

Yogita Ingle 6 years, 3 months ago

Formula of first n terms in AP = {tex}S_n = \frac{n}{2}(2a+(n-1)d){/tex}

Substitute n = 7

So,{tex} S_7 = \frac{7}{2}(2a+6d){/tex}

{tex}49 = \frac{7}{2}(2a+6d){/tex}

{tex}49 \times \frac{2}{7} = 2a+6d{/tex}

14= 2a+6d

Substitute n = 17

{tex}S_{17} = \frac{17}{2}(2a+16d){/tex}

{tex}289 = \frac{17}{2}(2a+16d){/tex}

{tex}289 \times \frac{2}{17} = 2a+16d{/tex}

34= 2a+16d

34= 2a+10d+6d

Using A

34= 14+10d

20 = 10d

d=2

Substitute the value of d in A

14= 2a+12

2= 2a

a=1

So, {tex} S_n = \frac{n}{2}(2(1)+(n-1)2){/tex}

{tex}S_n = \frac{n}{2}(2+(n-1)2){/tex}

ANSWER

Find the altitude corresponding to side EF if area of triangle abc=triangledef in triangleabc ab=8cm and altitude corresponding to ab is 5cm in triangle def ef=10cm

Posted by Sandeep Rathore 6 years, 3 months ago

CBSE > Class 10 > Mathematics

0 answers

ANSWER

the points (7,2)and (-1,0) lie on a line ?

Posted by Hoodie Protocol 6 years, 3 months ago

CBSE > Class 10 > Mathematics

1 answers

Yogita Ingle 6 years, 3 months ago

The given points are (7, 2) and (-1, 0)

The slope of the line is given by

{tex}m=\frac{y_2-y_1}{x_2-x-1}{/tex}

Substituting the values

{tex}m=\frac{0-2}{-1-7}\\\\m=\frac{-2}{-8}\\\\m=\frac{1}{4}{/tex}

Point slope form of a line is given by

{tex}y-y_1=m(x-x_1)\\\\y-2=\frac{1}{4}(x-7)\\\\4y-8=x-7\\\\4y=x+1{/tex}

ANSWER

Find the area of parallelogram in the adjoining figure

Posted by Sandeep Rathore 6 years, 3 months ago

CBSE > Class 10 > Mathematics

0 answers

ANSWER

Check whether - 150 is a term of the AP:11,8,5,2....

Posted by Sourav Dash 6 years, 3 months ago

CBSE > Class 10 > Mathematics

3 answers

Madhu Sharma 6 years, 3 months ago

Miss .K ?? 6 years, 3 months ago

a+(n-1)d =-150 11+(n+1)(-3)=-150 11-3n+3=-150 14-3n=-150 -3n=-150-14 -3n=-164 n =164/3. No, 150 is not the the term of ap

Munesh Gupta 6 years, 3 months ago

Lol

ANSWER

Cot theta 12/5 ,find all other trignometric ratios

Posted by Ashmit Pandey 6 years, 3 months ago

CBSE > Class 10 > Mathematics

0 answers

ANSWER

The sum of an AP whose first term is a , the second term is b and the last term is c , is equal to (a+c(b+c-2a)/2(b-a).

Posted by Vp Singh 6 years, 3 months ago

CBSE > Class 10 > Mathematics

1 answers

Yogita Ingle 6 years, 3 months ago

First term =a
second term =b
last term =c
common difference=(b-a)
tn =a+(n-1) d

c=a+(n-1) d

(c-a)=(n-1)(b-a)

(c-a)/(b-a)+1=n

( c+b-2a)/(b-a)=n--------------------(1)
now ,
we know sum of n terms=n/2 (first term+last term)
put equation (1)value
= (b+c-2a)/(b-a)(a+c)
hence Sn=[(b+c-2a)(c+a)/(b-a)]

ANSWER

The length of the diagonal of a cube that can be inscribed in a sphere of radius 8 cm is??????

Posted by Vidushi Saraw 6 years, 3 months ago

CBSE > Class 10 > Mathematics

0 answers

ANSWER

If median of a series exceeds the mean by 4 find by what number the mode exceeds its mean

Posted by Vidushi Saraw 6 years, 3 months ago

CBSE > Class 10 > Mathematics

0 answers

ANSWER

What is t probability of an impossible event

Posted by Priyanshu Kumar ????? 6 years, 3 months ago

CBSE > Class 10 > Mathematics

8 answers

Omm Upadhyay 6 years, 3 months ago

Nitin Raghuvanshi 6 years, 3 months ago

Aarohi Jha 6 years, 3 months ago

Probability of an impossible event is 0.

Parishi Thada 6 years, 3 months ago

Amit Bhatia 6 years, 3 months ago

Rishu Raj 6 years, 3 months ago

P(T)=0,when T is an impossible event

?Urstruley Ashu? 6 years, 3 months ago

Abhinav ? 6 years, 3 months ago

ANSWER

How to improve mathematics for boards ??

Posted by Akanksha Kumari? 6 years, 3 months ago

CBSE > Class 10 > Mathematics

7 answers

Omm Upadhyay 6 years, 3 months ago

No on read mathematics ncert not other book ??

Neel Mistry 6 years, 3 months ago

Hii

Rishu Raj 6 years, 3 months ago

Prepare hard and learn all formula first . Then understand what question says.????

5Thank You

?Urstruley Ashu? 6 years, 3 months ago

Practice more in maths text book

Diksha ? 6 years, 3 months ago

Practice and just practice?first ncert clear kr lo then alag kuch krna

Priyanshu Kumar ????? 6 years, 3 months ago

Practice

Nasim Bukhari 6 years, 3 months ago

10 hours study

ANSWER

For which values of P ,will the lines represented by the following pair of lonear equation be parallel ,3x -y-5=0,6x-2y-p=0

Posted by Sakthi Vel 6 years, 3 months ago

CBSE > Class 10 > Mathematics

1 answers

Nita Sharma 6 years, 3 months ago

Any value except 10

ANSWER

In an equilateral triangle ABC a point D is taken on BC such that BD: DC =1:2 prove that 9 ADsquare =7 BC SQUARE

Posted by Vidushi Saraw 6 years, 3 months ago

CBSE > Class 10 > Mathematics

0 answers

ANSWER

Write the fraction for the given shapes

Posted by Sudirdhika Shadwal 6 years, 3 months ago

CBSE > Class 10 > Mathematics

1 answers

Abhinav ? 6 years, 3 months ago

Where are the shapes??

ANSWER

Chapter 5 all questions sample paper cbse mathematics

Posted by Sahil Sehrawat 6 years, 3 months ago

CBSE > Class 10 > Mathematics

1 answers

Aarthy Kamaraj 6 years, 3 months ago

You can get all sample papers from www.cbse.online

ANSWER

If the pth,qth,&rth term of an Ap be a,b,c respectively show that a(q-r)+b(r-p)+c(p-q)

Posted by Khushi Singh 6 years, 3 months ago

CBSE > Class 10 > Mathematics

4 answers

Khushi Singh 6 years, 3 months ago

Bata nhi shakte par.hint to kar shakte ho?

Viswajeet Sharma 6 years, 3 months ago

Waise ek hint de sakte gau

Viswajeet Sharma 6 years, 3 months ago

Thoda long solution hi isiliye issme nhi bana sakte

Viswajeet Sharma 6 years, 3 months ago

Isse aap net mau giigle pe search kar lo

ANSWER

If the seventh term of an Ap is 1/9 & its 9th term is 1/7. Find its 63rd term

Posted by Khushi Singh 6 years, 3 months ago

CBSE > Class 10 > Mathematics

1 answers

Palak Verma 6 years, 3 months ago

a7=1/9 a+6d=1/9 let it be eq 1 a9=1/7 a+8d=1/7 let it be eq 2 Now substitute both by elimination method you will get value of a and d Then put it in a+62d You will get your answer

ANSWER

Solve the equation 3x^2- 5x+2 by using formula method

Posted by Sanjana K Sanjana K 6 years, 3 months ago

CBSE > Class 10 > Mathematics

1 answers

Khushi Singh 6 years, 3 months ago

3x² - 5x+2 3x²-3x-2x+2 3x(x-1) -2(x-1) (X-1)(3x-1) X=1 x =1/3

ANSWER

Construct a triangle DEF with side EF=6.5 ,angle D=105 , angle E=45 .Then construct a triangle whose sides are 3/5 times the corresponding sides of triangle DEF .

Posted by Gourav Verma 6 years, 3 months ago

CBSE > Class 10 > Mathematics

2 answers

Mr Gayab 6 years, 3 months ago

Only write construction

?Raj ? 6 years, 3 months ago

I can't draw it here please write your question on google you will get your ans

ANSWER

Prove 5 root3 is irrational

Posted by Arun Sindhur 6 years, 3 months ago

CBSE > Class 10 > Mathematics

3 answers

Khushi Singh 6 years, 3 months ago

Let 5√3 be a rational number. a/b=5√3 a/5b=√3 a/5b is a rational number.So,√3 is also a rational number. But the fact is that √3 is a irrational number. 5√3 be an irrational number.

Sambhav Maheshwari 6 years, 3 months ago

prove that 5√3 is irrational no Let 5√3 is rational number. 'a' and 'b' are two co-prime factor. a/b = 5√3 a/5b=√3 : Here a/5b are a rational Number. : √3 is also a rational Number. :: but it is contradiction because we know that √3 is irrational number. : :5√3 is a irrational number.

☣️Roman ☣️ 6 years, 3 months ago

Watch the example given on the ncert book?

ANSWER

two chords of a circle intersect at E such that CE=1.6 BE =3.2 AE=2.4 then find the length of DE

Posted by Sriraagavi.D.K Karthikeyan 6 years, 3 months ago

CBSE > Class 10 > Mathematics

1 answers

☣️Roman ☣️ 6 years, 3 months ago

1.2 units

ANSWER

there are 3 villages A,B and C such that the distances from A to B is 7km from B to C is 5km and C to A is 8km. The gram pradhan wants to dig a well in such a that the well from each village is equal. (i)which mathematical concept is used to solve the above question? (ii)what should be the location of the well? (iii)which value is depicted by gram pradhan?

Posted by Harini V. K 6 years, 3 months ago

CBSE > Class 10 > Mathematics

0 answers

ANSWER

An aeroplane left 30mimutes later than the schedule time and in order to reach its destination 1500 km away in time it increase its speed by 250km/h from the usual speed.find its usual speed

Posted by Gautam Kumar 6 years, 3 months ago

CBSE > Class 10 > Mathematics

0 answers

ANSWER

In triangle ABC , write sin A+B/2in terms of angle C

Posted by Sunita. N. K Snk 6 years, 3 months ago

CBSE > Class 10 > Mathematics

1 answers

Nitish Vishwakarma 6 years, 3 months ago

We know that in triangle ABC Angle (A + B + C) = 180 Transfer angle on right side, Angle(A+B) = 180- Angle C Dividing 2 on both side , we get Angle(A+B)/2 = 90 - Angle C/2 Multiply sin on both side sin A+B/2 = sin(90-C/2) sin A + B/2 = cos C/2

ANSWER

the sum of the third and the seventh terms of an A.P is 6 and their product is 8 . find the sum of first sixteen terms of A.P

Posted by Hima Babu 6 years, 3 months ago

CBSE > Class 10 > Mathematics

2 answers

Sambhav Maheshwari 6 years, 3 months ago

a + 2d +a + 6d=6 2a + 8d=6 Divide by 2 a + 4d = 3 (1) (a + 2d) (a + 6d) = 8. (2) From (1) a =3-4d Put the value of a in eq(2) (3-4d +2d) (3-4d + 6d) = 8 (3-2d) (3 +2d) =8 (3)^2 - (2d)^2 =8 9 - 4d = 8 -4d= 8-9 d= 1/4 Put the value of d in eq(1) a= 3 - 4(1/4) a= 3 -1 a=2 Sn =n/2(2a + (n - 1)d) S16= 16/2(2(2) + (16 -1)1/4) S16=8(4 +15/4) =8( 16+15/4) =8(31/4) =2(31) =62 ans

Viswajeet Sharma 6 years, 3 months ago

ANSWER

For any positive real number x, prove that there always exist an irrational number y satysfying 0<y<x

Posted by Yuvraj Mishra?????? 6 years, 3 months ago

CBSE > Class 10 > Mathematics

0 answers

ANSWER

For what value of p , are (2p-1) , 7 and 11p/2 three consecutive term of an AP

Posted by #Army #Bts 6 years, 3 months ago

CBSE > Class 10 > Mathematics

2 answers

#Army #Bts 6 years, 3 months ago

Thank you so much ?

Parul Ailawadi 6 years, 3 months ago

d=7-(2p-1)=7-2p+1=8-2p d=(11p/2)-7 =(11p-14)/2 Therefore, 8-2p=(11p-14)/2 16-4p=11p-14 16+14=11p+4p 30=15p 30/15=p p=2

ANSWER

Solve the pair of equations : 8x+7y/xy=15 and 7x-2y/xy=5 where x, y, ≠0

Posted by Piyush Meena 6 years, 3 months ago

CBSE > Class 10 > Mathematics

2 answers

Rishu Raj 6 years, 3 months ago

Value of X=1and Y=1

Shiven Handa 6 years, 3 months ago

8x+7y/xy=15 and 7x-2y/xy=5 8x+7x=15 and 7x-2x=5 15x=15 and 5x=5 x=1 and x=1 Putting x=1 in eq.(1) 8x+7y/xy=15 8x+7y=15xy 8×1+7y=15×1×y 8+7y=15y 8=15y-7y 8=8y y=1 Hence x=1 and y=1 .

ANSWER

Find the ratio in which the y axis divides the line segment joining the points (4,-6) and (-7,-4)

Posted by Lakshya Agrawal 6 years, 3 months ago

CBSE > Class 10 > Mathematics

3 answers

Rishu Raj 6 years, 3 months ago

Let,A(4,-6) ,B(0,y) and C(-7,-4). AB=X1=4,Y1=-6 ,BC=X1=0,Y1=Y X2=0,Y2=y , X2=-7,Y2=-4 AB=BC (0-4) ² +(Y-6)²=(-7-0)²+(-4-Y)² 16+Y²+36+2×Y×6=49 +16+y²-2×-4×-y 16+y²+36+12y=49+16+y²+8y 52+y²+12y=55+ý²-8y

Piyush Meena 6 years, 3 months ago

Pg 166 example 9

Piyush Meena 6 years, 3 months ago

You can take help from book