СРОЧНО! РЕШИТЬ УРАВНЕНИЕ (на фотке). Created by Top5Top5. algebra-ru

СРОЧНО! РЕШИТЬ УРАВНЕНИЕ (на фотке)...

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November 2021 1 5 Report

СРОЧНО!
РЕШИТЬ УРАВНЕНИЕ (на фотке)

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Universalka

Verified answer

$C_{n}^{2}=10\\\\\frac{n!}{2!*(n-2)!}=10\\\\\frac{(n-2)!*(n-1)*n}{1*2*(n-2)!}=10\\\\\frac{(n-1)*n}{2}=10 \\\\n(n-1)=20\\\\n^{2}-n-20=0\\\\n_{1} =5\\\\n_{2}=-4$

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