A. -1
B. 1
C. 2
D. -2
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 =