109概率中等derivationmedium
Expected Wait for the First Heart
题目
A standard 52-card deck is shuffled uniformly at random. Cards are turned over one at a time from the top. Let be the position of the first heart. Find .
解题计时
0:00
提交作答时记录,用于后续平均用时统计。
你的答案
题目
A standard 52-card deck is shuffled uniformly at random. Cards are turned over one at a time from the top. Let be the position of the first heart. Find .
解题计时
0:00
提交作答时记录,用于后续平均用时统计。
你的答案