Asmor's Geek Blog

Tag: Math

The Surprisingly Paradoxical Gender Problem

by on Jul.12, 2010, under Opinion

The recently deceased Martin Gardner was known for, among other things, his mathematical puzzles. Here’s one of them.

I have two children, one of whom is a son born on a Tuesday. What is the probability that I have two boys?

The alleged answer may surprise you. Knowing the child’s gender and day of birth does actually affect the proability. Allegedly. The answer is hidden below.

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(I’m not sure how this spoiler plugin is going to interact with the RSS feed, so just to be on the safe side I’m throwing a warning here that the answer is coming up and you should stop reading now if you don’t want it spoiled!) The chance of me having two boys is 13/27

I’ll also say that the answer is wrong , and in fact your initial intuition is right. (continue reading…)

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