Civil Services Prep

Prelims 2022 · CSAT / Logical Reasoning · Question 7

Which date of June 2099 among the following is Sunday?

  1. 4
  2. 5
  3. 6
  4. 7

Answer

7

  • Key fact: 1 January 2100 is Friday, so 1 January 2099 was Thursday because 2099 is not a leap year. Hence 1 June 2099 is Monday after adding 31+28+31+30+31 = 151 days; 151 mod 7 = 4.
  • (a) 4: If 1 June is Monday, 4 June is Thursday. Incorrect.
  • (b) 5: 5 June is Friday. Incorrect.
  • (c) 6: 6 June is Saturday. Incorrect.
  • (d) 7: 7 June is Sunday. Correct.
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