probability..急

For drawing 5 cards out of 52 cards, the number of favourable outcome = 52C5

To form a straight flush, there are totally 4 X 10 = 40 combinations.

That is A,2,3,4,5
2,3,4,5,6,
...
10,J,Q,K,A

And also 4 kinds of cards.

So, the required probability

= 40 / 52C5

= 0.0000154