Factorial of Factorial
Number Theory
Level
2
Find the number of non-negative integers satisfying the following equality─
The answer is 3.
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1 solution
True when n=n!. This is true for only 3 non-negative integers.
(0!)! = 0 = 0!
(1!)! = 1 = 1!
(2!)! = 2 = 2!