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If s1and s2 be the sum of 2n+1 terms of an AP and sum of its odd terms repectivily then prove that s1/s2 equal 2n+1/n+1

Posted by Neha Sharma 8 years, 2 months ago

CBSE > Class 11 > Mathematics

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100!-56!

Posted by Jayesh Paliwal 8 years, 2 months ago

CBSE > Class 11 > Mathematics

1 answers

Siya Makker 8 years, 2 months ago

56! (100 *99*98......tll. ..57-1)

1Thank You

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Perimeter of hemishphere

Posted by Devendra Singh 8 years, 2 months ago

CBSE > Class 11 > Mathematics

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nPr = rPn. nPn-r

Posted by Yamini Gond 8 years, 2 months ago

CBSE > Class 11 > Mathematics

1 answers

Digvijay Madheshiya 5 years ago

solve this question

9Thank You

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Prove the following: 15!/12!.3!+15!/11!.4!=16!/12!.4!

Posted by Nitish Yadav 8 years, 2 months ago

CBSE > Class 11 > Mathematics

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a minus b minus C square

Posted by Sanjay Verma 8 years, 2 months ago

CBSE > Class 11 > Mathematics

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Find the equation of a line passing through the point (7,9)and which is such that the portion of it between the axes is divided by the point in the ratio 4:3

Posted by Piyush Yadav 8 years, 2 months ago

CBSE > Class 11 > Mathematics

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A wire of length 121 cm is bent so as to lie along the arc of a circle of radius 180 cm find in degrees the angle subtended at the centre by the arc

Posted by Pooja Kumari 8 years, 2 months ago

CBSE > Class 11 > Mathematics

1 answers

Rahul Poddar 8 years, 2 months ago

38.5°

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Sec^2o+ cosec^2o>4

Posted by Gulshan K 8 years, 2 months ago

CBSE > Class 11 > Mathematics

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9+40i

Posted by Adarsh Kumar 8 years, 2 months ago

CBSE > Class 11 > Mathematics

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Cube root of 9+40i

Posted by Adarsh Kumar 8 years, 2 months ago

CBSE > Class 11 > Mathematics

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Find fourth term in expansion of (x-2y)¹²

Posted by Varinder Singh 8 years, 2 months ago

CBSE > Class 11 > Mathematics

1 answers

Preeti Chahar 8 years, 2 months ago

-1760x raise to power9 and y raise to power3

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156+456t

Posted by Vivek Lakra 8 years, 2 months ago

CBSE > Class 11 > Mathematics

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What is the value of -: cos1.cos2.cos3....................cos87.cos89 =? Challenge to all..

Posted by Anurodh Kumar 8 years, 2 months ago

CBSE > Class 11 > Mathematics

3 answers

Anurodh Kumar 8 years, 2 months ago

Please write step wise soln. Also

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Amit Srivastav 8 years, 2 months ago

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Moulik Anand 8 years, 2 months ago

1/2^1/2

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Lcm Of 123

Posted by Gourav Joon 8 years, 2 months ago

CBSE > Class 11 > Mathematics

1 answers

Swati Kandwal 8 years, 2 months ago

41*3

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Prove that :- sin10°sin30°sin50°sin70° = 1/16

Posted by Namra Shaikh 8 years, 2 months ago

CBSE > Class 11 > Mathematics

1 answers

Kuldeepsa Bhati 8 years, 2 months ago

LHS sin10 sin30 sin50 sin70 Convert in cos by 90- angle From last Cos20 cos40 cos60 cos 80 cos60=1/2 1/2 (cos20 cos40 cos80) Divide by 2sin20 1/2 (2sin20cos20 cos40 cos80/2sin20) 1/2 (sin40cos40 cos80/2sin20) 1/2 (2sin40cos40 cos80/2*2sin20) 1/2 (sin80cos80/4sin20) 1/2 (2sin80cos80/2*4sin20) 1/2 (sin160/8sin20) Sin160=sin20 1/2 (sin20/8sin20) Sin20 cancel with sin20 1/2 (1/8) 1/16 RHS

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What is the square root of -7-11i

Posted by Suman Dhama 8 years, 2 months ago

CBSE > Class 11 > Mathematics

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U={1,2,3,4,5,6,7,8,9},A={2,4,6,8} and B={2,3,5,7} verify (AUB)'=A'nB'

Posted by Ashwin Nayak 8 years, 2 months ago

CBSE > Class 11 > Mathematics

2 answers

Namra Shaikh 8 years, 2 months ago

A'={ 1,3,5,7,9} , B'={ 1,4,6,8,9} A'nB'={1,9} (AUB)= { 2,3,4,5,6,7,8, } (AUB)={1,9} Therefore:- (AUB) = A'nB' = {1,9}

2Thank You

Sourav Gupta 8 years, 2 months ago

First 123456789 second 2

3Thank You

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Three vertices of a parallelogram taken in order are (-1,-6),(2,-5)and(7,2). The fourth vertex is

Posted by Jayanti Gupta 8 years, 2 months ago

CBSE > Class 11 > Mathematics

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Three vertices of a parallelogram taken in order are

Posted by Jayanti Gupta 8 years, 2 months ago

CBSE > Class 11 > Mathematics

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Pmi

Posted by Mayank Yadav 8 years, 2 months ago

CBSE > Class 11 > Mathematics

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Find domain& range of f(x) = √48-xsquare

Posted by Namra Shaikh 8 years, 2 months ago

CBSE > Class 11 > Mathematics

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If sinX=-3^1/2/2 then find its princupal solution

Posted by Utkarsh Sathe 8 years, 2 months ago

CBSE > Class 11 > Mathematics

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What is the domain and range of signum function?

Posted by Namrata Das 8 years, 2 months ago

CBSE > Class 11 > Mathematics

0 answers

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(3-2i)(2+3i)/(1+2i)(2-i)

Posted by Guriya Kumari 8 years, 2 months ago

CBSE > Class 11 > Mathematics

0 answers

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sin5A=5sinA-20sin^3A+16sin^5A

Posted by Praneet Patel 8 years, 2 months ago

CBSE > Class 11 > Mathematics

0 answers

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What is roster form with example

Posted by Shubham Pundhir 8 years, 2 months ago

CBSE > Class 11 > Mathematics

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Find the second order derivatives Tan^-1[1+x]÷[1-x]

Posted by Vijay Mantheena 8 years, 2 months ago

CBSE > Class 11 > Mathematics

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Draw a quad in the cartesian plane whose vertices are (-4,5),(0,7),(5,-5)and-4,-2).also find its area .

Posted by Sarmy And Singh Singh 8 years, 2 months ago

CBSE > Class 11 > Mathematics

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Sides of a triangle ABC are in AP.If a<min{b,c},then cos A may be equal to...?????

Posted by Ritika Bhardwaj Ritika 8 years, 2 months ago

CBSE > Class 11 > Mathematics

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