How many prime numbers are there between 1 and 20?
- A.6
- B.7
- C.8 ✓
- D.9
Explanation: 2, 3, 5, 7, 11, 13, 17, 19 — that's 8 primes.
Class 6 IMO Mathematics Olympiad practice · Number Sense · Factors, Multiples & Primes
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