3 folk fortune-telling cards _ 3 folk fortune-telling cards

1. First, there are 52*5 1*50 ways to extract three from 52 sheets.

2. Straight flush: (Take spades) Draw 3 cards from 13, with the method of 13 * 12 * 1, so the four suits have 4 * 13 * 65438. So the probability of a flush is (4 *13 *12 *1122/425.

3. Straight: A to K, regardless of color, there are A23,234, …, jqk, qka 12 routes.

Three different cards have a suit change of 4*4*4, so there is a method of 12 * 4 * 4 * straight. So the probability of going straight is (12 * 4 * 4 * 4)/(52 * 51* 50) = 32/5525.

Similarly, if the straight of qka is not considered, it is (11* 4 * 4)/(52 * 51* 50) = 88/16575.

Hope to adopt, thank you.