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Out of 15 consecutive numbers, 2 are chosen at random. The probability that they are both odds or both primes is_________?

Correct answer: D. Cannot be determined

  • A. 10/17
  • B. 10/19
  • C. 46/105
  • D. Cannot be determined

Explanation

The actual set of 15 consecutive numbers is not given, and the number of primes and odd numbers can change with the starting number. Thus the probability cannot be determined from the information supplied. Students may choose a numerical option by silently assuming the numbers are 1 to 15, but that assumption is not stated.

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