2021 · Q94
How many pairs of twin prime numbers between 1 and 50?
Elementary MathematicsNumber System
- A2
- B3
- C6
- D5
Explanation
Twin primes differ by 2. Between 1 and 50 these are (3,5), (5,7), (11,13), (17,19), (29,31), (41,43) — 6 pairs. Hence option C.