Instructions

What should come in place of the question mark (?) in the following number series?

Question 156

1, 1, 2, 6, ?, 120

Solution

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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