A. nxy
B. nx(x+yn)
C. nx(nx+y)
D. none
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 =
The coefficient of x2 in (1+x)2(8-x)-1/3 is