the next number is 120.

1x1 = 1

2x1 = 2

3x2 = 6

4x6 = 24  

5x24 = 120  

6x120= 720  

and so on.

 see the pattern. So, the series is 1, 1, 2, 6, 24, 120, 720, …

Nth=(N-1)*((N-1) term +(N-2) term)

3rd=1x(1+1)=2

4th=2x(2+1)= 6

5th=3x(6+2)=24

6th=4x(24+6)=120

hope this will be helpful !!

Answer:

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Step-by-step explanation:

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