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Find the 4^(t h)term in the expansion o...

Find the `4^(t h)`term in the expansion of `(x-2y)^(12)`.

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It is known that (r+1)th term `(T_(r+1))` in the binomial expansion of
`(T_(r+1))` = `""^nC_r``b^(n-r)``b^r`
the 4th term in the expansion
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