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| Counting triplets III (Posted on 2011-11-14) |
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Consider three prime numbers A, B and C with A ≤ B ≤ C ≤ 20, and determine the total number of triplets (A, B, C) such that the respective last digits of A+B+C and A*B*C are the same. No computer programs!
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Date |
 | solution | Charlie | 2011-11-14 16:07:47 |
| answer | Dej Mar | 2011-11-14 13:49:28 |
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