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6! + 4! = 720 + 24 = 744
10! and 6! means factorial of 10, and factorial of 6, respectively. You can calculate that on most scientific calculators - or you can multiply all numbers from 1 to 6 for the factorial of 6, and all numbers from 1 to 10 for the factorial of 10.
Factorial 6 = 720
1.8333
It is: 9*8*7*6*5*4*3*2*1 = 362,880