defence exam Agniveer Vayu Group X & XY Mock Test 01/2026 Mathematics Binomial Theorem Special Terms of Binomial Expansion
The sum of the coefficient of x2/3 and x–2/5 in the binomial expansion of \(\rm \left( x^{2/3} + \frac{1}{2} x^{-2/5} \right)^9\) is :
1
21/4
2
69/16
3
63/16
4
19/4