Which pair of numbers is a pair of twin primes (prime numbers differing by 2)?
- A.(3, 5) ✓
- B.(5, 9)
- C.(7, 10)
- D.(11, 14)
Explanation: 3 and 5 are both prime and differ by 2. The other pairs each contain a non-prime number.
Class 6 IMO Mathematics Olympiad practice · Number Sense · Factors, Multiples & Primes
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