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Find a if 17th and 18th terms in the exp...

Find a if 17th and 18th terms in the expansion of `(2+a)^(50)` are equal.

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We know that General term of expansion `(a+b)^{n}` is
`T_{{r}+1}=\ ^{n} C_{T} a^{1-r-r} b^{T} `
`T_{17}=T_{16+1} text { of }(2+a)^{50}`
Put `{r}=16, {n}=50, {a}=2` and `{b}={a}` in (1)
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