(2n + 3)!...

negativka @negativka

October 2021 1 28 Report

чему равно (2n + 1)!/(2n + 3)!

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hELFire

$\frac{(2n+1)!}{(2n+3)!} = \frac{1*2*...*2n*(2n+1)}{1*2*...*(2n+2)*(2n+3)}=\frac{1}{(2n+2)(2n+3)}=\\ \\ =\frac{1}{4n^2+10n+6}$

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