Let's consider the card labeled as follows:
Aces: A1,A2,A3,A4
Non-Aces: B1,B2
The total number of ways to choose 2 cards out of 6 for the first pile is (62). After choosing the first pile, we choose 2 cards out of the remaining 4 for the second pile, which is (42). The remaining 2 cards automatically form the third pile, and this can be done in (22) ways.
Total ways is: (62)×(42)×(22)
But we have to divide 3!, since the order of the piles doesn't matter.
So we get (62)×(42)×(22)6 = 15
Next, we count the number of favorable outcomes where each pile contains exactly one Ace. Each pile must have one Ace and one non-Ace. There are 4 Aces (A1,A2,A3,A4) and 2 Non-Aces (B1,B2).
The assignment of Aces to each pile can be done in 4 ways for first pile 3 ways for second 2 for final simplifying: 4×3×2 = 24 ways
Every non-ace gets included ensuring simplified piles count as above:
415



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