A. ±4
B. ±2
C. ±3
D. ±8
If Tr+1 is the term independent of x in (3x-5/x3)8 then r=
The 4th term of (1-2x)-1 when x=1/3 is
If xr occurs in the expansion (x+1/x2)2n, then its coefficient is:
The sum of the coefficients of (1+2x-4x2)35 is
The number of non zero terms in the expansion of (x+a)100 + (x-a)100 is