Very difficult Math question from Chung's book

celesteroberts
Fri, 19 Apr 2013 10:43:23 +0000

Agree with purple acorn.

6 ways to arrange BCD

2 ways to pick first and last card: A-G or G-A.

6 ways to arrange EF: EF or FE before BCD, or the same after BCD, or one on each side of BCD, with E before BCD or F before.

6 x 2 x 6 = 72