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Counting Quadruplets (Posted on 2010-08-20) Difficulty: 3 of 5
Each of A, B, C and D is a positive integer with the proviso that A ≤ B ≤ C ≤ D ≤ 20.

Determine the total number of quadruplets (A, B, C, D) such that A*B*C*D is divisible by 50.

No Solution Yet Submitted by K Sengupta    
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  Subject Author Date
SolutionsolutionDej Mar2010-08-21 04:36:06
Using Excel . . .hoodat2010-08-20 20:41:02
re: wrong SolutionAdy TZIDON2010-08-20 20:21:16
Some Thoughtsre: Solution -- ERR0NEOUSAdy TZIDON2010-08-20 20:09:33
SolutionSolutionhoodat2010-08-20 19:58:08
re: Solutioned bottemiller2010-08-20 19:06:32
SolutionSolutionPraneeth2010-08-20 17:29:13
Agreeded bottemiller2010-08-20 16:44:15
Hints/TipsCONTINUE MY COUNTINGAdy TZIDON2010-08-20 14:38:49
Hints/Tipscounting on line - a starterAdy TZIDON2010-08-20 14:09:20
Solutionsome thoughts; then computer solution (spoiler)Charlie2010-08-20 13:56:11
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