A. 0
B. an
C. -an
D. an-1
(2n+1)C0-(2n+1)C1+…………. -(2n+1)C2n =
The coefficient of x2 in (1+x)2(8-x)-1/3 is
C02+3.C12+5.C22+……….+(2n+1).Cn2 =
1.nC0+41.nC1+42.nC2+43.nC3+……..+4n.nCn =
3.C0+7.C1+11.C2+……..+(4n+3).Cn =
(1.02)6 + (0.98)6 =
(2-)5 + (2+)5 =
If the 3rd, 4th and 5th terms of (x+a)n are 60, 160 and 240 respectively then (x,a,n)=
C2+C4+C6+……….. =
In the expression of (x4- (1/x3))15 coefficient of x32 is equal to :