A. 1
B. 2
C. 3
D. -2
C1/1 – C2/2 + C3/3 – C4/4 +………. +(-1)n-1 Cn/n =
The coefficient of x5 in the expression of (1+x)21+(1+x)22+……+(1+x)30 is
The coefficient of x7 in (ax2-1/bx)11 is equal to the coefficient of x-7 in (ax-1/bx2) then ab=
The number of non zero terms in the expansion of (8+2)101 - (8-2)101 is
The coefficients of three consecutive terms in the expansion of (1+x)n are in the ratio 1:7:42, then n=
Which term of (2x-3y)12 when x=1, y=5/2 numerically greatest?
If two consecutive terms in the expansion of (x+a)n are equal where n is a positive integer then (n+1)a/x+a is
If the sum of odd terms and the sum of even terms in the expansion of (x+a)n are p and q respectively then p2+q2=
If the coefficients of (2r+1)th term and (4r+5)th term in the expansion of (1+x)10 are equal then r=
If the 3rd, 4th and 5th terms of (x+a)n are 720, 1080 and 810 respectively then (x,a,n)=