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Middle term in the expansion of (a^(3) +...

Middle term in the expansion of `(a^(3) + ba)^(28)` is ......

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Given expansion is `(a^(3) + ba)^(28)`
`:. N = 28`
`:.` Middle term `= ((28)/(2) + 1)th` term = 15 th term
`:. T_(15) = T_(14 + 1)`
`= .^(28)C_(14) (a^(3))^(28 - 14) (ba)^(14)`
`= .^(28)C_(14) a^(42) b^(14) a^(14)`
`= .^(28)C_(14) a^(56) a^(14)`
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