5 factorial = 5*4*3*2*1 = 120
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145 1! = 1 4! = 24 5! = 120
5! is the symbol for Factorial 5 , ie 5 x 4 x 3 x 2 = 120 different ways
5 is in the "tens" place so its value is 5 tens, ie 50.
6! + 4! = 720 + 24 = 744
It is: 9*8*7*6*5*4*3*2*1 = 362,880