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If the rth term in the expansion of (1+x...

If the rth term in the expansion of `(1+x)^20` has its coefficient equal to that of the (r+ 4)th term, find r

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Given
`(1+x)^{20}`
and rth term is equal to `(r+4)` th term
`Rightarrow a=1, b=x, n=20 `
...
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