A. 2

B. 4

C. 6

D. 8

The 3^{rd} term of ^{4} (3x-y^{3})is

5^{th} term of (2x^{2}+3/x)^{5} is 10. Then x=

The coefficient of x^{n} in(1+x)^{2}/(1-x)^{2} is

The term independent of x in (x+1/x)^{6} is

The sum of the coefficients of even powers of x in the expansion of (1+x+x^{2})^{15} is