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Last digit counts (Posted on 2014-07-23) Difficulty: 3 of 5
How many 4-digit numbers are there such that their last digit is either sum or product of the first three?

1. EX: 1258 and 4090 qualify.
2. No leading zeroes.

See The Solution Submitted by Ady TZIDON    
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  Subject Author Date
Solutioncomputer solutionCharlie2014-07-23 14:30:25
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