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प्रश्न
What is the chance that a leap year, selected at random, will contain 53 Sundays?
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उत्तर
A leap year has 366 days
366 = 52 × 7 + 2
∴ there are 52 weeks and 2 other days.
These 2 days can be Sunday-Monday; Monday-Tuesday; Tuesday-Wednesday; Wednesday-Thursday; Thursday-Friday; Friday-Saturday; Saturday-Sunday.
∴ there are 7 possibilities and favorable cases are 2
∴ the required probability = `2/7`
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