137概率简单数值题short
Exactly Two Heads in Four Flips
题目
You flip 4 fair coins. What is the probability that exactly 2 of them land heads?
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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
You flip 4 fair coins. What is the probability that exactly 2 of them land heads?
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