What is 3!+4! ?

Answer: A. 30

The ! sign means multiply down to 1. 3! = 3 x 2 x 1 = 6 and 4! = 4 x 3 x 2 x 1 = 24, so 3! + 4! = 6 + 24 = 30. Adding 3 + 4 to get 7 is a common trap.

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