四、何謂生命之鏈？請簡述消防人員出勤時 CPR 之操作方式？適用時機？並說明成人與新生兒脈搏觸摸位置與按壓位置之異同？（25 分）

3. (10%) Suppose we are playing draw poker. We are dealt (from a well shuffled deck) 5 cards which contain 4 spades and another card of a different suite. We decide to discard the card of a different suite and draw one card from the remaining cards to complete a flush in spades (all 5 cards spades). Determine the probability of completing the flush.