 Welcome to cbsenotes.com! To post messages or access any member only section, you will need an account. Create your free account now.
CBSE Notes 2011-2012 » XI-Maths

# Binomial Theorem

## The coefficients of (r - 1)th, rth and (r + 1)th terms in the expansion of (1 + x)n are in the ratio...

The coefficients of (r - 1)th, rth and (r + 1)th terms in the expansion of (1 + x)n are in the ratio of 1:3:5 Find n and r.

## The 2nd, 3rd and 4th terms in the expansion of (x + y)n are 240, 720 and 1080 respectively. Find the...

The 2nd, 3rd and 4th terms in the expansion of (x + y)n are 240, 720 and 1080 respectively. Find the values of x, y and n.

## Find the value of r if the coefficients of (2r + 4)th and (r - 2)th terms in the expansion of (1 + x...

Find the value of r if the coefficients of (2r + 4)th and (r - 2)th terms in the expansion of (1 + x)18 are equal

## In the binomial expansion of (x + 1)n, the coefficients of the fifth, sixth and seventh terms are in...

In the binomial expansion of (x + 1)n, the coefficients of the fifth, sixth and seventh terms are in arithmetic progression. Find all the values of n for which this can happen,

## Find a if the coefficients of x2 and x3 in the expansion of (3 + ax)9 are equal. 