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What is the probability that a leap year has 53 Sundays and 52 Mondays?

Correct answer: B. 1/7

  • A. 0
  • B. 1/7
  • C. 2/7
  • D. 5/7

Explanation

A leap year has 366 days = 52 weeks plus 2 extra days, so exactly two consecutive weekdays occur 53 times. For Sunday to occur 53 times but Monday to occur only 52 times, the extra days must be Saturday and Sunday, which happens for 1 of the 7 possible starting weekdays. The likely mistake is 2/7, which counts every case containing Sunday and includes Sunday-Monday, where Monday also occurs 53 times.

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