8. When playing poker, if we get 2 cards of the same rank (like two 5s), we say we have a "pair of 5s." If we get 3 cards of the same rank (like 3 Ks), we say we have a "trio of Ks." When we get 4 cards of the same rank, we say we have a "bomb." In a deck of poker cards, we need to draw at least ( ) cards to guarantee having "a bomb."


【Answer】 42
【Analysis】Most of the words before the question are for distraction, useless. The question means "In a deck of playing cards, at least ( ) cards need to be taken out to ensure that there are 4 cards of the same rank." Using the worst-case principle, $2+13 \times 3+1=42$ cards. 【Lecture Comparison】Worst-case, Long-term Class Summer Class Lecture 1; Short-term Class Lecture 3, Three Major Principles.