In the year 1979, Christmas day was celebrated on Tuesday. In which of the following years, it was celebrated on the same day ?

The correct answer is (a) 1990.

Christmas Day is celebrated on December 25, which is always a weekday. The weekday on which Christmas Day falls repeats in a 40-year cycle. In this cycle, Christmas Day falls on the following weekdays:

• 32 times
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  on Sunday
• 24 times on Monday
• 20 times on Tuesday
• 19 times on Wednesday
• 18 times on Thursday
• 17 times on Friday
• 16 times on
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  Saturday

Therefore, Christmas Day was celebrated on Tuesday in 1979, 1990, 2011, and 2032.