The probability of having 53 Sundays in a randomly selected leap year is ______.
Options:
(A) 1/7
(B) 1/4
(C) 2/7
(D) 4/7
Official Answer Key:
C
Step-by-Step Solution & Explanation
• A leap year has 366 days = 52 complete weeks + 2 extra days, guaranteeing 52 Sundays already.
• The 2 extra days can be one of 7 equally likely consecutive pairs; exactly 2 of these pairs contain a Sunday: (Sun,Mon) and (Sat,Sun).
• Probability of 53 Sundays = 2/7.
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