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How many prime numbers lie between 60 and 80?

Competition practiceNumber & Arithmetic
  • A5
  • B4
  • C6
  • D3

Step-by-Step Solution

The primes are 61, 67, 71, 73 and 79 — five in all. (63, 65, 69, 75 and 77 are composite, and every even number in the range is composite.)
Answer: A) 5

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