(1) The first card is arbitrary. The flush probability of the second card is 1 1/5 1. The flush probability of the third card and the second card is 10/50. The flush probability of the fourth and third cards is 9/49. 1 1/5 1* 10/50*9/49=0.79%

(2) What is a flush? 2? 3? 4? 5 this situation. A * * * has only 44 kinds (4 colors, one from A234 to JQKA. 44/(52c4)= 1.625* 10^-4=0.00 16%

(3) 13c2 = 78, 4 * 4 = 16, 78 * 16/2 = 624 has 624 pairs, so 624/(52C4)=0.023%.

(4) 13/(52 C4)= 1/20825 = 0.0048%

(5) The pair of1is 2 cards. You want 4 cards. . .

(6) Same color and same flower.