Factorial
The notation 4! is used as an abbreviation for the product 4 x 3 x 2 x 1 so that 4! = 24. Similarly, 9! = 9 x 8 x 7 x 6 x 5 x 4 x 3 x 2 x 1 = 362880. Work out the value of:
1)3!
2)7!
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1) 3! would be 3 * 2 * 1 = 6
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