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What is the sum of all prime numbers between 60 and 80?

  • A.351
  • B.350
  • C.349
  • D.345

Answer: A

We need to identify the prime numbers between 60 and 80.

Prime numbers are: 61, 67, 71, 73, 79.

Sum = \(61 + 67 + 71 + 73 + 79\).

Sum = \((60+1) + (60+7) + (70+1) + (70+3) + (70+9) = 120 + 210 + (1+7+1+3+9) = 330 + 21 = 351\).

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