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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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  Subject Author Date
re(2): analytic solution, subject to errorCharlie2015-11-19 13:31:43
re: analytic solution, subject to errorSteve Herman2015-11-19 13:11:49
Solutionanalytic solution, subject to errorCharlie2015-11-19 11:13:05
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