A. -2
B. -1
C. -3
D. -4
The coefficient of xr (0<r<n-1) in the expansion of (x+3)n-1+(x+3)n-2. (x+2)+ (x+3)n-3. (x+2)2+……+(x+2)n-1 is
nC0+nC1+nC2+………+nCn =
If the 5th term is 24 times the 3rd term in the expansion of (1+x)11 then x=
If Tr+1 is the term independent of x in (3x-5/x3)8 then r=
The 4th term of (1-2x)-1 when x=1/3 is
If xr occurs in the expansion (x+1/x2)2n, then its coefficient is:
The sum of the coefficients of (1+2x-4x2)35 is
The number of non zero terms in the expansion of (x+a)100 + (x-a)100 is
If (3 + 4i) is a root of x<sup>2</sup>+px+q=0, then (p, q) is:
The term independent of x in the expansion of (1+x+2x3)(3x2/2-1/3x/)9 is