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In an AP of 50 term's the sum of first 10 terms is 210 and the sum of last 15 terms is 2565. Find the A.P.

Posted by Ankit Bhardwaj 6 years, 2 months ago

1 answers

Pradum Gurjar 6 years, 2 months ago

Sn=n/2[2a+(n-1)d] S10=10/2[2a+(10-1)d] 210=5[2a+9d] By transposing 210÷5=2a+9d 2a+9d=42••••••(1) Last 15th term=50-15 =35 S35=2565 S35=35/2[2a+(n-1)d] 2565=35/2[2a+(35-1)d] 2565=35a+34d•••••(2) By elimination

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ANSWER

How much board paper comes from last years board paper?

Posted by Abhishek Chaudhary 6 years, 2 months ago

CBSE > Class 10 > Mathematics

3 answers

Arpit Srivastava 6 years, 2 months ago

no anynew paper

0Thank You

Rajeshwari Bidiyasar 6 years, 2 months ago

I hope easy than last year papers

1Thank You

Clm Gy 6 years, 2 months ago

Not sure..but almost same like that..

1Thank You

ANSWER

which term of an AP have 121, 117, 113, ..........is its first negative term

Posted by Anjum Parveen 6 years, 2 months ago

CBSE > Class 10 > Mathematics

2 answers

Arpit Srivastava 6 years, 2 months ago

32nd term

1Thank You

Ayushi Rawat 6 years, 2 months ago

The answer is 32nd term

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ANSWER

Frustum of cone

Posted by Prabal Patel 6 years, 2 months ago

CBSE > Class 10 > Mathematics

2 answers

Arpit Srivastava 6 years, 2 months ago

a part of cone

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Aadya Singh ? 6 years, 2 months ago

1/3πh[R² + r² + Rr]

1Thank You

ANSWER

Solve the following pairs of equations by reducing them to a linear equations: 2/√x +3/√y and 4/√x -9/√y=_1

Posted by Balamurugan Balu 6 years, 2 months ago

CBSE > Class 10 > Mathematics

0 answers

ANSWER

Use Euclid's division lemma to show that the square if a positive integer is either of the form 3M or 3M + 1 for some integer m

Posted by Gourav Sarkar 6 years, 2 months ago

CBSE > Class 10 > Mathematics

0 answers

ANSWER

The length of minute hand of a clock is 5cm. Find the area swept by the minute hand during the time 4:05 to 4:40 a.m.

Posted by Shabana Khatoon 6 years, 2 months ago

CBSE > Class 10 > Mathematics

2 answers

Arpit Srivastava 6 years, 2 months ago

2245.83333333cmsquare

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Aadya Singh ? 6 years, 2 months ago

2245.833 cm square...

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ANSWER

1\x+4-1/x-7=11/30,x≠-4,7

Posted by Sahil Ahmed 6 years, 2 months ago

CBSE > Class 10 > Mathematics

0 answers

ANSWER

How many terms of the AP : 9,17,25,....must be taken to give a sum of 636?

Posted by Vibhuti Khurana 6 years, 2 months ago

CBSE > Class 10 > Mathematics

2 answers

Bhumika Agrawal 6 years, 2 months ago

636 is the sum of 12 terms

1Thank You

Mudit Bansal 5 years, 11 months ago

12 is the answer Hi are u single

2Thank You

ANSWER

Is it important to refer refreshers for ch circles class 10 for standard maths or ncert is enough ??

Posted by Ramneek Singh 6 years, 2 months ago

CBSE > Class 10 > Mathematics

2 answers

Bhumika Agrawal 6 years, 2 months ago

You have to refer refresher

1Thank You

Riya Rathore 6 years, 2 months ago

U have to refer refresher

1Thank You

ANSWER

×+1+×-2=3 ×-1+×+2

Posted by Gurmeet Singh 6 years, 2 months ago

CBSE > Class 10 > Mathematics

2 answers

Bhumika Agrawal 6 years, 2 months ago

x=-1

0Thank You

Aadya Singh ? 6 years, 2 months ago

x = -1

2Thank You

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Tangents drawn from an external point to the circle are equal vertices of triangle ABC are inexterior of circle so

Posted by Mukesh Kumar 6 years, 2 months ago

CBSE > Class 10 > Mathematics

2 answers

Bhumika Agrawal 6 years, 2 months ago

It is not compulsory sometime is true and sometime is false

1Thank You

Vaani Maini 6 years, 2 months ago

No false

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What is major

Posted by Ayush Sharma 6 years, 2 months ago

CBSE > Class 10 > Mathematics

4 answers

Vaani Maini 6 years, 2 months ago

Important seniour or significant

0Thank You

Diksha? 6 years, 2 months ago

Major means big. For eg. There are two arcs in a circle,the larger one will be called major arx

0Thank You

Ravinder Rawat 6 years, 2 months ago

Hap bhan k land

1Thank You

Ayush Sharma 6 years, 2 months ago

Batao na major kya hai

2Thank You

ANSWER

Distance of point P(2,3) from the x-axis using distance formula

Posted by Ramneek Singh 6 years, 2 months ago

CBSE > Class 10 > Mathematics

2 answers

Yogita Ingle 6 years, 2 months ago

Given the point P(2,3).

We have to find the distance from x-axis i.e perpendicular distance from x-axis.

In the graph , we see in order to determine the perpendicular distance the point of x-axis to be taken is (2,0)

Therefore, the distance is 3-0=3.

Hence, the distance of point P(2,3) from x-axis is 3 units.

2Thank You

Chirag Sharma 6 years, 2 months ago

2Thank You

ANSWER

Ex7 .1

Posted by Aaman Singh 6 years, 2 months ago

CBSE > Class 10 > Mathematics

0 answers

ANSWER

loose sheets are available or not in exam

Posted by Chirag Sunar 6 years, 2 months ago

CBSE > Class 10 > Mathematics

1 answers

Piyush Kr.?? 6 years, 2 months ago

Don't worry about that this will be not required....

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A bag contains 18 balls out of which x balls are red. i) If one ball is drawn at random from the bag, what is the probability that it is not red? ii) If two more balls are put in the bag, the probability of of drawing a red ball will be 9/8 times the probability of drawing a red ball in the first case. Find the value of x.

Posted by Harsha Rajesh 6 years, 2 months ago

CBSE > Class 10 > Mathematics

4 answers

Ajay ???? 6 years, 2 months ago

Let the red balls be x Probability of not red is 18-x/18 ii) x/20= 9×(18-x)/8×18 x/20=162-9x/144 144x=20(162-9x) 144x=3240-180x 144x+180x=3240 324x=3240 x=10

0Thank You

Ashwani Yadav 6 years, 2 months ago

If i consider 2 balls are red then x = 8

0Thank You

Ashwani Yadav 6 years, 2 months ago

Your question is not clear. Because u have not mentioned which 2 balls .

0Thank You

Piyush Kr.?? 6 years, 2 months ago

Since, the value of x comes 10...hence the probability of the ball not to be red is 4/9 in first case.!!!!

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ANSWER

Derivation of frustum of cone, all formulas. Is it important?

Posted by Arjun Sharma 6 years, 2 months ago

CBSE > Class 10 > Mathematics

0 answers

ANSWER

I am from basic so do we need to do optional exercises too? Will optional exercise questions will come in the cbse board paper 2019 -2020 or not?

Posted by Diya Bhadoria 6 years, 2 months ago

CBSE > Class 10 > Mathematics

2 answers

Sshivam Tyagi 3 years ago

No its clearly written at the bottom left of the page of the optional exersices that they are not from exam point of view but its good for practice i will not even come in standard

0Thank You

Arjun Sharma 6 years, 2 months ago

See the cbse paper pattern has changed recently. Therefore, nobody really have an idea about What is gonna come in standard but may not be coming in basic. Therefore, my advice would be, try to attempt all the questions from ncert

2Thank You

ANSWER

Is ncert is enough to get good marks in pre board

Posted by Mansi Walia 6 years, 2 months ago

CBSE > Class 10 > Mathematics

5 answers

Sai Samar Sinha 6 years, 2 months ago

Ya ,better bt not excellent.

0Thank You

Ankush Raj 6 years, 2 months ago

U should look to some reference book? also

0Thank You

Ankush Raj 6 years, 2 months ago

I don't think so

0Thank You

Dinesh Kumar 6 years, 2 months ago

Yes,but in perfect manner and also in bord

0Thank You

S.Abiskar Ashutosh 6 years, 2 months ago

1Thank You

ANSWER

Eculid division lemma

Posted by Suhail Pathan 6 years, 2 months ago

CBSE > Class 10 > Mathematics

3 answers

Bhumika Agrawal 6 years, 2 months ago

Given positive integer A and B such that unique integer q and r satisfy a = bq + r zero equal to greater than r less than b

0Thank You

Riya Kumari Shah 6 years, 2 months ago

Where 0≤b<r *

0Thank You

Riya Kumari Shah 6 years, 2 months ago

a=bq+r, where 0 ≤ r <b

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ANSWER

Karl marx ideas of socialism .( in points with side headings)

Posted by Sonia Kalsi 6 years, 2 months ago

CBSE > Class 10 > Mathematics

0 answers

ANSWER

If n is an odd integer then show that n^2-1 divisible by 8

Posted by Priyanshu Sahu 6 years, 2 months ago

CBSE > Class 10 > Mathematics

6 answers

Miss. 1234 6 years, 2 months ago

hence, we conclude that 4P² + 4P is divisible by 8 for all natural number . hence, n² -1 is divisible by 8 for all odd value of n .

1Thank You

Miss. 1234 6 years, 2 months ago

P =3 then, 4P² + 4P = 4(3)² + 4(3) = 36 + 12 = 48 , divisible by 8

0Thank You

Miss. 1234 6 years, 2 months ago

P =2 then, 4P² + 4P = 4(2)² + 4(2) =16 + 8 = 24, it is also divisible by 8 .

0Thank You

Miss. 1234 6 years, 2 months ago

Now, when P = 1 then, 4P² + 4P = 4(1)² + 4(1) = 4 + 4 = 8 , it is divisible by 8.

0Thank You

Miss. 1234 6 years, 2 months ago

We know , odd number in the form of (2P +1) where P is a natural number , so, n² -1 = (2P + 1)² -1 = 4P² + 4P + 1 -1 = 4P² + 4P

0Thank You

Bhumika Agrawal 6 years, 2 months ago

If n is 4 n square + 1 here b is equals to 4the possible value of r is 0 ,1 ,2 ,3 but we take odd positive integer so we take 4q + 1 and 4q + 3 case first when n is equals to 4 Cube + 1 in this case we have any square - 14 Cube + 1 ka whole square minus 1 16 square + 8 + 1 - 1 16 square + 88 cube to cube + 1 and square minus 1 is divisible by 8 second case when was 24 Cube + 2 in this case we have

1Thank You

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If P =2×2×2×2×2×3×3×5 Find LCM and HCF

Posted by Punam Devi 6 years, 2 months ago

CBSE > Class 10 > Mathematics

5 answers

Aayush Kumar Chandrawanshi 6 years, 2 months ago

please complete the question

0Thank You

Bhumika Agrawal 6 years, 2 months ago

???

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Miss. 1234 6 years, 2 months ago

Yeah..

0Thank You

Bhumika Agrawal 6 years, 2 months ago

This question is incomplete

0Thank You

Miss. 1234 6 years, 2 months ago

for finding LCM and HCF .....there must be 2 numbers.....P is the one no. ...then, where is the other no. given in this ques??...??

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ANSWER

the sum of the square of two consecutive natural number is 313 and find the number

Posted by Bhumika Agrawal 6 years, 2 months ago

CBSE > Class 10 > Mathematics

1 answers

Amarjit Kaur 6 years, 2 months ago

Let 1st no. = x 2nd consecutive no. =x+1 X^2 + ( x+1)^2 =313 X^2 +x^2 +2x+1=313 2X^2+2x+1-313=0 2x^2 +2x -312 = 0 2(x^2 + x -156) =0 X^2 +x-156=0 Splitting middle term X^2 +13x -12x -156 =0 X(x+13)- 12(x+13)=0 (x+13)(x-12)=0 x+13=0 or x-12=0 X= -13 or x=12 X= -13(not possible as -13 is not nature number) So, x=12 and x+1 = 13 Hope this will help u?

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Q.11.The distance between the points (cos ) and ( , - cos ) is a)√3 b) 2 c) 1 d)√2

Posted by Akshay K 6 years, 2 months ago

CBSE > Class 10 > Mathematics