If the (r+1)^ th term in the expansion of ( a^ 1/3 b^ 1/6 + b^ 1/2 a^ 1/6 )^ 21 has equal exponents of both a...

Question

If the (r+1)^ th term in the expansion of ( a^ 1/3 b^ 1/6 + b^ 1/2 a^ 1/6 )^ 21 has equal exponents of both a and b, then value of r is

Accepted Answer

(B)

JEE Main Mathematics question