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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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Using Excel . . . | Comment 10 of 11 |
TZIDON - My bad.  I missed the less than OR EQUAL TO sign.  I assumed that integers could not equal each other.

Using Excel, I come up with 1570.  I will retry the Statistics method later.

Edited on August 20, 2010, 8:44 pm
  Posted by hoodat on 2010-08-20 20:41:02

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