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Cool sequence 1 (Posted on 2003-04-24) Difficulty: 3 of 5
Here is a cool sequence.


What goes in the blank?

See The Solution Submitted by Tim Axoy    
Rating: 3.5000 (8 votes)

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Solution More compact notation (spoiler) | Comment 7 of 9 |
I believe that some people use the notation n!! = n!(n-1)!(n-2)!...2!1!

The series is simply 1!!,2!!,3!!,4!!,5!!,6!!.

  Posted by ajosin on 2005-03-22 22:06:05
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