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770

Q:

There are some friends, all less than 20 years. When paired amongst themselves they realize that the sum of their ages is a multiple of 5. If their ages are distinct prime numbers, then the number of possible pairs are: 

  • 1
    7
  • 2
    5
  • 3
    8
  • 4
    6
  • Show Answer
  • Workspace

Answer : 1. "7"

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