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7! = 7 x 6 x 5 x 4 x 3 x 2 x 1
7! = 5.040
b.)
5! + 4! = (5 x 4 x 3 x 2 x 1) + (4 x 3 x 2 x 1)
5! + 4! = 120 + 24
5! + 4! = 144
c.)
10!/8! = (10 x 9 x 8 x 7 x ... x 1) / (8 x 7 x ... x 1)
10!/8! = 10 x 9
10!/8! = 90
= 5040
b. 5! + 4! = 5.(4!) + 4!
= 6.(4!)
= 6 x 4 x 3 x 2 x 1
= 144
c.
=90