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If the fifth term of the expansion (a^(2...

If the fifth term of the expansion `(a^(2//3)+a^(-1))^n` does not contain `'a'`. Then `n` is equal to a. `2` b. `5` c. `10` d. none of these

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`T_{5}=T_{4+1} `
`=^{n} C_{4}(a^{2 / 3})^{n-4}(a^{-1})^{4} `
`=\ ^{n} C_{4} a^{(frac{2 n - 8}{3}-4)}`
For this term to be independent of `a`, we must have ...
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