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Counting correctly (Posted on 2015-11-19) Difficulty: 3 of 5
Find the number of 7-digit (base-10) numbers, such that each of the digits 1,2,3,4,5 must appear in the number (once or more).

Clearly, no leading zeros.

No Solution Yet Submitted by Ady TZIDON    
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re: analytic solution, subject to error | Comment 2 of 3 |
(In reply to analytic solution, subject to error by Charlie)

Charlie:


Heaven forbid, I would never complain that somebody elected to tackle a problem analytically.  But I am curious why you didn't write a computer program.  Feeling whimsical?  I seems to me that you could code this one with one hand tied behind your back.  Is it just that it would be too easy?

Steve 

  Posted by Steve Herman on 2015-11-19 13:11:49
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