A. (3x)n+1
B. (2x)n+1
C. (2x)n
D. (3x)n
The general term of (2a-3b)-1/2 is
The coefficient of xr in (1+x)2/(1-2x)3 is
49n+16n+k is divisible by 64 for n?N. Then the numerically least –ve integer value of k is
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