Determine the total number of quadruplets (A,B, C, D) of positive integers with A ≤ B ≤ C ≤ D ≤ 25, such that (A+B)*(C+D) is divisible by |A*D – B*C|, whenever A*D ≠ B*C.
: |x| refers to the absolute value
(In reply to computer solution
Do me a favor , Charlie
I'®ve tried to evaluate manually the total number of quadruplets (A,B, C, D) of positive integers with A <= B <= C <= D <= 25, and got 20175.
Please, check my result by adding another counter to your program and make me happy (or busy again).
Edited on February 7, 2011, 1:59 am