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Counting triplets (Posted on 2010-03-31) Difficulty: 3 of 5
For how many ordered triplets (a, b, c) of positive integers, each less than 10 is the product abc divisible by 20?

See The Solution Submitted by Ady TZIDON    
Rating: 4.0000 (1 votes)

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re: By hand | Comment 5 of 7 |
(In reply to By hand by Steve Herman)

9,6,5 wouldn't work; that's why Ed actually found only 20
  Posted by Charlie on 2010-03-31 15:22:09

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