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CSAT 2021 paper

UPSC CSE CSAT 2021 · Question 47 · Data interpretation & sufficiency

Consider two Statements and a Question:

CSAT 2021 · Q47

Data interpretation & sufficiency Easy

Consider two Statements and a Question:

  1. Statement-1: The last day of the month is a Wednesday.
  2. Statement-2: The third Saturday of the month was the seventeenth day.
  3. Question: What day is the fourteenth of the given month?

Which one of the following is correct in respect of the Statements and the Question?

Answer & explanation

Answer: (b) Statement-2 alone is sufficient to answer the Question

Knowing the third Saturday is the 17th fixes every date: Saturdays fall on the 3rd, 10th and 17th, so the 14th is a Wednesday. The last day being a Wednesday does not help without knowing how many days the month has.

  1. Statement-2: the third Saturday is the 17th, so Saturdays fall on the 3rd, 10th and 17th.
  2. The 14th is 4 days after Saturday the 10th — a Wednesday. Statement-2 alone answers the Question.
  3. Statement-1: the last day is a Wednesday, but the month may have 28, 29, 30 or 31 days, so the 14th could be Wednesday, Tuesday, Monday or Sunday — not sufficient.
  4. So Statement-2 alone is sufficient.
  • ✗ (a) Without the month's length, the last day being Wednesday leaves four possibilities for the 14th.
  • ✓ (b) Saturday the 17th means Saturday the 10th, so the 14th is a Wednesday.
  • ✗ (c) Statement-1 is not needed.
  • ✗ (d) Statement-2 alone is sufficient.

Remember · A dated weekday fixes the whole month; a 'last day' clue also needs the month's length.

Question and answer: UPSC's official GS Paper II (2021, Series A) — paper ↗ · answer key ↗. Explanation: Minimalist IAS, checked 30 Sept 2026 (how we verify). ·

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