hard · GRE Quant
For an integer n with 2 ≤ n ≤ 12, consider the quantity n! + (n-1)!. Indicate ALL values of n for which n! + (n-1)! is a perfect square.
- n = 3
- n = 4
- n = 5
- n = 6
- n = 7
- n = 9
- n = 11
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