Question

the binomial coefficient of 21th term is the expansion of (a+b)^23 is .​

Answer 1

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${21}^{th} \: term \: of \: the \: expansion \:$

$= \binom{23}{20} {a}^{(23 - 20)} \times {b}^{20}$

$= \binom{23}{20} {a}^{3} \times {b}^{20}$

So the numerical coefficient = $\binom{23}{20}$

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