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What is the chance that a leap year, selected at random, will contain 53 Saturdays?

1. 2/7
2. 3/7
3. 1/7
4. 5/7

Correct answer: 2/7

Solution

A leap year has 52 full weeks plus 2 extra days forming one of 7 equally likely consecutive pairs. Two of those pairs (Fri-Sat and Sat-Sun) include a Saturday, so the probability of 53 Saturdays is 2/7, not 3/7.

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