CTET PAPER II 2019 · PYQ · Number System / Twin Primes · medium
How many pairs of twin primes are there between the integers 1 to 100?
A.5
B.6
C.7
D.8✓ Correct
Explanation
Twin primes are pairs of primes that differ by 2. Between 1 and 100, the twin prime pairs are: (3,5), (5,7), (11,13), (17,19), (29,31), (41,43), (59,61), and (71,73). This gives 8 pairs of twin primes.
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