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The 15 twin prime numbers between 1 and 100 are in 8 pairs. The twin prime pairs are (3, 5), (5, 7), (11, 13), (17, 19), (29, 31), (41, 43), (59, 61), and (71, 73).
There are 25 prime numbers between 1 and 100.
There are 25 prime numbers less than 100
The answer depends on how many prime numbers are whose!