# 【Puzzle】有放回抽样还是无放回抽样

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## Should-You-Sample-with-or-wothout-Replacement

Two urns contain red and black balls, all alike except for color
Urn A has 2 red balls and 1 black
Urn B has 101 red and 100 black
An urn is chosen at random, and you win a prize if you correctly name the urn on the basis of evidence of two balls drawn from it
After the first ball is drawn and its color is reported, you can decide whether or not the ball shall be replaced before drawing the second
How do you order the second drawing, and how do you decide the urn?

• A 桶有 2 个红球和 1 个黑球。
• B 桶有 101 个红球和 100 个黑球。

• 有放回抽样

• 无放回抽样

• 有放回抽样
• 无放回抽样

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