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One is a sum (Posted on 2013-07-05) Difficulty: 3 of 5
a. How many 4 digit numbers are there such that at least one digit is a sum of 2 or 3 of the others?
b. How many 5 digit numbers are there such that at least one digit is a sum of 2,3 or 4 of the others?

The following conditions apply both for a and for b:
*No leading zeros.
*The numbers consist of distinct digits.

No Solution Yet Submitted by Ady TZIDON    
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  Subject Author Date
Solutioncomputer solutionCharlie2013-07-07 12:25:57
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