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CSAT 2021 paper

UPSC CSE CSAT 2021 · Question 67 · Number system

Consider the following statements: The sum of 5 consecutive integers can be 100.

CSAT 2021 · Q67

Number system Easy

Consider the following statements:

  1. 1.The sum of 5 consecutive integers can be 100.
  2. 2.The product of three consecutive natural numbers can be equal to their sum.

Which of the above statements is/are correct?

Answer & explanation

Answer: (c) Both 1 and 2

Five consecutive integers add to five times the middle one, so 18 to 22 give 100. And 1, 2, 3 have product 6 and sum 6, so both statements are correct.

  1. Five consecutive integers add to 5 × (middle one); 5 × 20 = 100, e.g. 18 + 19 + 20 + 21 + 22 = 100. Statement 1 is correct.
  2. 1 × 2 × 3 = 6 and 1 + 2 + 3 = 6. Statement 2 is correct.
  3. Both statements are correct.
  • ✓ 1. 18 + 19 + 20 + 21 + 22 = 100.
  • ✓ 2. 1, 2, 3: product 6 = sum 6.

Remember · A 'can be' statement is proved by one example; try the smallest numbers first.

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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