The next number is 120.
1x1 = 12x1 = 23x2 = 64x6 = 24 5x24 = 120 6x120= 720 and so on.
You see the pattern. So, the series is 1, 1, 2, 6, 24, 120, 720, …In general, the nth number is (n-1)!
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