
Kenneth S. answered 03/24/16
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There are only 4 ways to get AKQJ10 from the same suit (because there are only 4 suits).
Those are called Royal Flushes, I believe.
So P(Royal Flush) = 4 / 52C5 = 4/2,598,960 = 1.5391 × 10-6 or about 0.0000015391