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If x^4 occurs in the rth term in the exp...

If `x^4` occurs in the rth term in the expansion of `(x^4+1/(x^3))^(15),` then find the value of `rdot`

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The correct Answer is:
`r=8`
`T_(r-1) = .^(15)C_(r) (x^(4))^(15-r) (1/(x^(3)))^(r ) = .^(15)C_(r)x^(60-7r)`
`rArr 60 - 7x = 4`
`rArr 8`
Then, the required term in `9^(th)`
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