Question

Cn,2=136 .Resolvam por favor

Answer 1

Olá Eliza

C(n,2) = 136 

n!/(n - 2)!2! = 136 

n!/(n - 2)! = 272

n*(n - 1)*(n - 2)!/(n - 2)! = 272

n² - n - 272 = 0

delta
d² = 1 + 1088 = 1089
d = 33

n = (1 + 33)/2 = 17 

n = 17

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