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.
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 20100820 20:41:02 