medium Probability

Odd Coin Flips

A release-checked medium problem for training Conditional Probability, Discrete Random Variables.

Question

You flip $100$ fair coins simultaneously. What is the probability that you observe an odd number of heads?

Practice focus

This Probability problem is tagged Conditional Probability, Discrete Random Variables. State the random variables and conditioning information explicitly, then check the result against boundary cases before opening hints or a solution.

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