STRAIGHT FLUSH

A straight flush is a hand that made up of five cards in series, all of the same suit, such as Q♣ J♣ 10♣ 9♣ 8♣ (a hand that meets the requirements of both a straight, and a flush). Two such hands are in comparison by their card that is ranked highest. Aces can play low in straights and straight flushes: 5♦ 4♦ 3♦ 2♦ A♦ is a 5-high straight flush, also known as a "steel wheel".{2}{3}
In five-card poker, there are 40 possible straight flushes, such as the 4 royal flushes. The probability of being dealt a straight flush is.
In seven-card poker for example Texas hold 'em, the number of occurrence of straight flush is 41,584 (4,324 for royal flush and 37,260 for non-royal straight flush), the likelihood of straight flush is around 0.0311% (0.0032% for royal flush and 0.0279% for non-royal straight flush).