Calcola:
A)
5!/9!·(9!/4!) = 5
B)
10!/(7!·3!)·3! = 720
C)
5!/(3!·2!)·(4!/(2!·2!)) + 4!/(2!·2!)·(3!/(2!·1!))=
=10·6 + 6·3= 78
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