Find the missing number, 1, 2, 6, 24, 120, _____

Find the missing number, 1, 2, 6, 24, 120, _____

Answer is:

720

Explanation:

1 x 1 = 1
1 x 2 = 2
2 x 3 = 6
6 x 4 = 24
24 x 5 = 120
120 x 6 = 720

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