A. 6C3(x)3(2/x2)2

B. 6C3(x)3(2/x3)3

C. 6C3(x)2(2/x3)2

D. 6C3(x)2(2/x2)3

If x is so small that x^{2} and higher powers of x may be neglected then (1-x)^{1/2}(1+x)^{2/3}/(1-x)^{1/2}

3√1003 -3√997

If n is even then C_{0}^{2}-C_{1}^{2}+C_{2}^{2}-……….+(-1)^{n }C_{n}^{2} =

The number of non-zero terms in the expansion of (1+3√2x)^{9}+(1+3√2x)^{9}is equal to:

If the coefficient of rth term and (r + l)th term in the expansion of (1 + x)^{20} are in the ratio 1 : 2, then r is equal to: