On what dates of April 2001 did Wednesday fall?
Answer and explanation
Correct answer: D. 4th, 11th, 18th, and 25th
- Step 1: 1st April 2001 odd days: up to 2000 = 0. Jan(3) + Feb(0) + Mar(3) + Apr 1(1) = 7 days = 0 mod 7 = Sunday.
- Step 2: If 1st April is Sunday, then 2nd is Monday, 3rd is Tuesday, and 4th is Wednesday.
- Step 3: Subsequent Wednesdays fall on 4 + 7 = 11, 11 + 7 = 18, and 18 + 7 = 25.
Why not the others: The remaining options (3rd, 10th, 17th, and 24th, 5th, 12th, 19th, and 26th, 2nd, 9th, 16th, and 23rd) violate logical deduction rules, confuse necessary and sufficient conditions, or stem from calculation slips.
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