72 is correct. Can you please tell me where I went wrong initally?
Each paid of D_E is 2!, and we have three pairs. 2!*2!*2! = 8
We have three pairs 3*2*1 = 6
6*8 = 48.
Any advice where I screwed up?
if you mean D_E and E_D, it is wrong. D_E E_D D_E does not work.
HOT! GMAT TOOLKIT 2 (iOS) / GMAT TOOLKIT (Android) - The OFFICIAL GMAT CLUB PREP APP, a must-have app especially if you aim at 700+ | PrepGame