SOLUTION: 3,3,6,18,?,360,2160 What comes in the question mark?

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Question 1088060: 3,3,6,18,?,360,2160
What comes in the question mark?
Answer by ikleyn(52788) About Me  (Show Source):
You can put this solution on YOUR website!
.
a%5Bn%5D = 3*n!, n = 0, 1, 2, 3, . . .


? = 3*4! = 3*24 = 72.


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