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A factorial in seconds (Posted on 2017-04-18) Difficulty: 2 of 5
For what value of n will n! be equal
to the number of seconds in 6*n weeks?

See The Solution Submitted by Ady TZIDON    
Rating: 5.0000 (1 votes)

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Solution solution in under 200 seconds with calculator | Comment 1 of 6
(n-1)! is the number of seconds in 6 weeks, which is 7*24*3600*6 = 3628800.

Successively dividing  3628800 by 1, 2, 3, etc. we see that it is 10!; that is (n-1)! is 10! so n-1 = 10 and n = 11.

  Posted by Charlie on 2017-04-18 09:21:01
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