A. nn

B. n!

C. 2n

D. 2n!

If the 5^{th} term is 24 times the 3^{rd} term in the expansion of (1+x)^{11} then x=

If T_{r+1} is the term independent of x in (3x-5/x^{3})^{8} then r=

The 4^{th} term of (1-2x)^{-1} when x=1/3 is

If x^{r} occurs in the expansion (x+1/x^{2})^{2n}, then its coefficient is:

The sum of the coefficients of (1+2x-4x^{2})^{35} is