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The list 2, 3, 5, 7, 11, 15, 17 is meant to follow one simple rule. Which number is out of place?

Competition practiceNumber Series
  • A15
  • B11
  • C17
  • D7

Step-by-Step Solution

These are consecutive prime numbers; after 11 comes 13. is not prime.
Answer: A) 15

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