You have a set of 10 cards—five red and five blue. Each group of five colored cards is numbered one through five.
What is the probability of drawing a red four and then a blue four, while replacing the card between the drawings?
A company has determined that 1% of its widgets are defective.
If a customer received 2 widgets, what is the probability that they are both defective?

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@jcoury

Do you know about the pigeonhole principle?

@OregonDuck

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