A number is a perfect number if the sum of its factors (other than itself) equals the number. Which of these is a perfect number?
- A.6 ✓
- B.8
- C.10
- D.12
Explanation: Factors of 6 (excluding itself): 1, 2, 3 — and 1+2+3 = 6.
Class 6 IMO Mathematics Olympiad practice · Number Sense · Factors, Multiples & Primes
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