Ronaldo's House

Easy

Probability

Ronaldo lives in Portugal in a house numbered 122577122577. A hurricane hits Portugal, and two random numbers on Ronaldo's house fall off. After the hurricane passes, he sees the numbers on the ground, but has amnesia, so he doesn't remember what his house number is. So, he places the two numbers up in the two empty spots uniformly at random. Find the probability Ronaldo creates the number 122577122577 again.

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Conditional Probability

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Ronaldo's House

Easy

Probability

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