A. (k+1)n+1-1/n+1
B. (k-1)n+1-1/n+1
C. (k-1)n+1+1/n+1
D. (k+1)n+1+1/n+1
If x+y=1, then 2.nCrxr.yn-r =
2.C2+6.C3+12.C4+……….+n(n-1)Cn =
If the sum of the coefficients of (1+2x)n is 6561, then the greatest coefficient is
If (1+x+x2)n =Σr=02n rxr then a0+a2+a4+……….+a2n=
If n is a positive integer, then value of (3n+2)nC0+(3n-1) nC1+(3n-4) nC2+……..+ 2(nCn) is
The middle term of (1-3x+3x2-x3)2n is
(1.03)19 =
x2n-1+y2n-1 is divisible by x+y if n is
If (1+x+x2)n = a0+a1x+a2x2+……..+a2nx2n then a02-a12+a22-……….+a2n2 =
(2n+1)C0-(2n+1)C1+…………. -(2n+1)C2n =