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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?

  Submitted by Ady TZIDON    
Rating: 4.0000 (1 votes)
Solution: (Hide)
ans: 102 See detailed analytical solution + verification by Charlie. Remember what ordered pair (or triplet) stands for.

Comments: ( You must be logged in to post comments.)
  Subject Author Date
re: Old dog, new tricks?Charlie2010-03-31 17:43:24
Old dog, new tricks?ed bottemiller2010-03-31 15:50:35
re: By handCharlie2010-03-31 15:22:09
SolutionBy handSteve Herman2010-03-31 14:18:25
re: Solution (interpretations)Jer2010-03-31 14:09:23
SolutionsolutionCharlie2010-03-31 14:06:39
Solution (interpretations)ed bottemiller2010-03-31 12:23:44
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