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

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