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Problem #55 · September 20, 2026

Prime numbers

How many prime numbers are less than 2020?
  1. A66
  2. B77
  3. C99
  4. D88

WORKED EXAMPLE

Solution

The prime numbers less than 2020 are: 2,3,5,7,11,13,17,192, 3, 5, 7, 11, 13, 17, 19 — a total of 88. 11 is not prime, and 22 is the only even prime number.
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