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Ven0801
@Ven0801
June 2022
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sedinalana
3*(n-3)!/(n-5)1 -(n-2)!/2!(n-4)=69
3(n-4)(n-3) -(n-3)(n-2)/2=69
6(n-4)(n-3)-(n-3)(n-2)-138=0
6n²-42n+72-n²+5n-6-138=0
5n²-37n-72=0
D=1369+1440=2809
√√D=53
n=(37-53)/10=-1,6 не удов усл
n=(37+53)/10=9
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Answers & Comments
3(n-4)(n-3) -(n-3)(n-2)/2=69
6(n-4)(n-3)-(n-3)(n-2)-138=0
6n²-42n+72-n²+5n-6-138=0
5n²-37n-72=0
D=1369+1440=2809
√√D=53
n=(37-53)/10=-1,6 не удов усл
n=(37+53)/10=9