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Let 7√11/3 be rational 7√11/3= r 7√11=3r √11=3r/7. .......(1) Here is r is rational 3r is rational 3r/7 is rational Therefore √11 is rational, which is a contradiction . So our supposition was wrong 7√11/7 is irrational.

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In an Ap, if the common difference (d)=-4,and the seventh term is 4,then find the first term.

Posted by Himanshu Sharma 7 years, 4 months ago

CBSE > Class 10 > Mathematics

1 answers

..... ...... 7 years, 4 months ago

T7= 4, d=-4 Or, a+6(-4)= 4 a= 4+24= 28

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Please give me important questions

Posted by Aman Yadav 7 years, 4 months ago

CBSE > Class 10 > Mathematics

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90 = v/540*360

Posted by Manvi Tiwari 7 years, 4 months ago

CBSE > Class 10 > Mathematics

1 answers

Devesh Chaudhary 7 years, 4 months ago

17496000

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Can give Solution of 14.1 by all three methods of mean

Posted by Lovepreet Singh 7 years, 4 months ago

CBSE > Class 10 > Mathematics

1 answers

Kuldeep Kuldeep Pal 7 years, 4 months ago

Fhvcnhg FL

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1/2-/2-1/2-x

Posted by Ajit Chahal 7 years, 4 months ago

CBSE > Class 10 > Mathematics

0 answers

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Did cbse put question only ncert book

Posted by Manoj Yadav 7 years, 4 months ago

CBSE > Class 10 > Mathematics

1 answers

Dhruvrajsinh Vala 7 years, 4 months ago

Questions are based on information given in ncert books but the questions are asked in different ways.

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How to verify the sums of intesers

Posted by Lovepreet Singh 7 years, 4 months ago

CBSE > Class 10 > Mathematics

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The sum of first q terms of an AP is 63q-63q2 if it's pth term is -60,find the value of p. Also, find the 11th term term of this AP

Posted by Aditya Sharma 7 years, 4 months ago

CBSE > Class 10 > Mathematics

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The area of a rectangula hall us 48 sq. m. If the length and breadth be increased by 1m each, the area in inceased by 15 sq.m. Find the length and the breadth of the hall.

Posted by Khushi Naik 7 years, 4 months ago

CBSE > Class 10 > Mathematics

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How money will add to paytam

Posted by Durgesh Verma 7 years, 4 months ago

CBSE > Class 10 > Mathematics

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11term of the AP -3,-1/2, 2 ........is

Posted by Abhilasha Mehta 6 years, 5 months ago

CBSE > Class 10 > Mathematics

1 answers

Sia ? 6 years, 5 months ago

The given AP is {tex} - 3,\frac{1}{2},2,......{/tex}
Here, a = -3
{tex}d = - \frac{1}{2} - ( - 3) = - \frac{1}{2} + 3 = \frac{5}{2}{/tex}
and n = 11
a₁₁ = ?
We have, a_n = a + (n - 1)d
So, {tex}{a_{11}} = - 3 + (11 - 1)\left( {\frac{5}{2}} \right){/tex}
{tex} \Rightarrow {a_{11}} = - 3 + 25{/tex}
{tex} \Rightarrow {a_{11}} = 22{/tex}

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What is rational and irrational ..

Posted by Anubhav Pandey 7 years, 4 months ago

CBSE > Class 10 > Mathematics

2 answers

Manikant Kumar 7 years, 4 months ago

a no. of the form p/q or which could be express in the form of p/q where p and q are integers and q is not equal to 0 is known as rational no. a no. which is not of the form p/q or which could nog be expressed in the form p/q where p and q are integers and q is not equal to 0 is known as irrational no.

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Abhi Gouda 7 years, 4 months ago

p/q=0 rational number p/q=/o

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In a triangle ABC in which D and E are point on AB and AC or DE parallel to BC hand ratio of AD/BD=3:4 if AC=5.6

Posted by Raiss Siddiqui 7 years, 4 months ago

CBSE > Class 10 > Mathematics

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

Posted by Ajat Jaat 6 years, 5 months ago

CBSE > Class 10 > Mathematics

1 answers

Sia ? 6 years, 5 months ago

According to the question,we have,
a=9. Therefore, common difference d =17-9=8
let the required number of terms be n.
Therefore, S_n=636
{tex}\Rightarrow{/tex}{tex}\frac{n}{2}{/tex}[2a+(n-1)d]=636
{tex}\Rightarrow{/tex}{tex}\frac{n}{2}{/tex}[2(9)+(n-1)8]=636
{tex}\Rightarrow{/tex}n[18+8n-8]=1272
{tex}\Rightarrow{/tex}8n²+10n-1272=0
{tex}\Rightarrow{/tex}4n²+5n-636=0
{tex}\Rightarrow{/tex}4n²+53n-48n-636=0
{tex}\Rightarrow{/tex}n(4n+53)-12(4n+53)=0
{tex}\Rightarrow{/tex}(4n+53)(n-12)=0
{tex}\Rightarrow{/tex}4n+53=0 or n-12=0
{tex}\Rightarrow{/tex}n={tex}\frac{{ - 53}}{4}{/tex} or n=12
Since number of terms cannot neither be negative nor fraction, n=12
hence, the required number of terms is 12.

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How to solve problems in a short period of time in exams?

Posted by Aman Tyagi 7 years, 4 months ago

CBSE > Class 10 > Mathematics

2 answers

Mauli Sheth 7 years, 4 months ago

By understanding the question properly and the answering it so that after completing the paper we dont have to recheck itt

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Abhishek Chaudhary 7 years, 4 months ago

By hard working

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Show that square of any positive integer cannot be of the from 5q plus2 or5q plus3

Posted by Anurag Gangawane 7 years, 4 months ago

CBSE > Class 10 > Mathematics

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If the altitude of a triangle is only it's median, then would it always be an equilateral triangle? PLZZ reply asap.....

Posted by Neerja Sharma 7 years, 4 months ago

CBSE > Class 10 > Mathematics

4 answers

Neerja Sharma 7 years, 4 months ago

Plzz explain why......??

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Durgendra Singh 7 years, 4 months ago

It is not necessary that a triangle with altitude coinciding with its median will always be an equilateral triangle.It could be an isosceles triangle also.

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Mumaiz Peer 7 years, 4 months ago

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Abhi H 7 years, 4 months ago

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If the squared difference of the zeros of the quadratic polynomial f(x)=x2+px+45 is equal to 144 find the value of p.

Posted by Manasvi Maggu 7 years, 4 months ago

CBSE > Class 10 > Mathematics