Find the probability that a non-leap year has 53 Sundays:

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OPSC ASO (Maths & Reasoning) 27 Aug 2022 Official Paper
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  1. 2/7
  2. 5/7
  3. 1/7
  4. 6/7

Answer (Detailed Solution Below)

Option 3 : 1/7
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Given:

A non-leap year has 365 days.

1 week = 7 days, so 365 days = 52 weeks + 1 extra day.

Formula Used:

Probability = Favorable outcomes / Total outcomes

Calculation:

In a non-leap year:

365 days = 52 full weeks + 1 extra day.

This extra day can be any one of: Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, or Sunday.

Out of these, the probability of the extra day being a Sunday is 1/7.

⇒ Total Sundays in a non-leap year = 52 Sundays (from 52 weeks) + 1 (if the extra day is Sunday).

⇒ Probability of having 53 Sundays = 1/7.

Final Answer:

The probability that a non-leap year has 53 Sundays is 1/7.

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