This number is a composite.

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C(10,4) = 2*3*5*7 = 7# = 210, i.e., the number of combinations of 10 objects taken 4 at a time is a primorial. Does there exist a larger example that ignores C(n,1) and C(n,n-1)? [Honaker]

Submitted: 2018-03-26 09:19:55;   Last Modified: 2018-03-29 16:31:59.
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