Question

Calcule o valor ou simplifique:

d)n!/n-2!
e)n+1!/n+2!
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Answer 1

n!/n-2!

n(n-1)(n-2)/(n-2)!

n(n-1)

n²-n

n+1!/n+2!

(n+1)!/(n+2)(n+1)!

1/n+2