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Select the number that best completes the analogy: 17 : 7 :: 31 : ?

Competition practiceAnalogy & Classification
  • A10
  • B11
  • C12
  • D13

Step-by-Step Solution

The relation is a prime number : its place in the list of primes. Counting 2, 3, 5, 7, 11, 13, 17, the number 17 stands seventh. Counting on 19, 23, 29, 31, the number 31 stands eleventh, so the answer is 11. The distractors are the off-by-one counts made by a solver who starts at 3 instead of 2 or who counts 1 as a prime.
Answer: B) 11

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