Mathematics
What is the probability that a randomly chosen leap year has 52 Sundays?
Probability
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Answer
In a leap year, there are 366 days.
366 days = 52 weeks + 2 days
The 7 possible pairs for the 2 extra days are:(Monday, Tuesday)(Tuesday, Wednesday)(Wednesday, Thursday)(Thursday, Friday)(Friday, Saturday)(Saturday, Sunday)(Sunday, Monday)
Total number of possible outcomes = 7
Number of outcomes where a Sunday occurs = 2 [(Saturday, Sunday) and (Sunday, Monday)]
Number of outcomes where a Sunday does not occur = 7 - 2 = 5. {i.e,(Mon, Tue), (Tue, Wed), (Wed, Thu), (Thu, Fri), (Fri, Sat)}
Let E be the event that a leap year has exactly 52 Sundays,
∴ P(E) =
Hence, option 3 is the correct option.
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