✔ 最佳答案
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