A. 2
B. 4
C. 6
D. 8
The 3rd term of 4 (3x-y3)is
5th term of (2x2+3/x)5 is 10. Then x=
The coefficient of xn 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+x2)15 is