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Trips, without a boat/quads:

[2 * C(3,2) * 44]/C(50,3) = ~1.35% or ~73.24 to 1

2 of either of your cards (no boat/quads restriction):

[2 * C(3,2) * 48]/C(50,3) = ~1.47% or ~68 to 1

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Can you explain this calc format for me? Particularly what the C function is....