Multiple choice

Find the missing terms to complete the given series. 1 2 3 3 5 5 7 7 9 11 ___ ____

  1. 11,13

  2. 12,13

  3. 11,12

  4. None of these
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A Correct answer
AI explanation

Separate the given sequence into two alternating series: the terms at odd positions are 1, 3, 5, 7, 9, 11, and the terms at even positions are 2, 3, 5, 7, 11. The first series consists of consecutive odd numbers, so the next odd-position term is 11. The second series consists of consecutive prime numbers, making the next even-position term 13. The missing terms are 11 and 13.

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