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.

(In reply to

Solution by Praneeth)

**TOTALLY WRONG:**

Case 1: 4 chosen from p

** NOT NECESSERALLY DISTINCT,BUT **

**MUST INCLUDE 5^2 AND 2 **

So:

**20,20,20,20 15,15,15,20 10,15,15,20 10,10,15,20 **

10,10,10 ,10, 5,10,10,10 ETC ARE OK

**5,5,5.15 5,5,5.5 ARE not OK **

** **

Count them ,it is more than 1

**So are other cases**