In a leap year, what is the probability of having exactly 5 Wednesdays in the month of October?

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Official Explanation

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In a leap year, we need to determine the probability of having exactly 5 Wednesdays in October. The total number of days in October is 31. We can have the following cases for the Wednesdays: Case 1: Dates {3, 10, 17, 24, 31} are Wednesdays. Case 2: Dates {2, 9, 16, 23, 30} are Wednesdays Case 3: Dates {1, 8, 15, 22,…

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What this question tests

What it tests

Your ability to compute probabilities of single and compound events, including 'at least one' questions.

Common trap

Forgetting to use the complement for 'at least one', or treating dependent events as independent.