3! = 1 x 2 x 3 = 6 4! = 1 x 2 x 3 x 4 = 24∴ 3! + 4! = 6 + 24 = 30 7! = 1 x 2 x 3 x 4 x 5 x 6 x 7 = 5040 ∴ 3! + 4! ≠ 7!