What should come in place of the question mark (?) in the following number series?
1, 1, 2, 6, ?, 120
The pattern is :
1 $$\times 1$$ = 1
1 $$\times 2$$ = 2
2 $$\times 3$$ = 6
6 $$\times 4$$ = 24
24 $$\times 5$$ = 120
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