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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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Hints/Tips CONTINUE MY COUNTING | Comment 3 of 11 |

20 20 20 20     thats 1

x   20 20 20    19 possible sol.

x   y  20 20     19^2  sol

x y z 20        please continue  with one twenty :and then  0 twenties

 

I MUST QUIT NOW

9


  Posted by Ady TZIDON on 2010-08-20 14:38:49
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