Multiple choice

A series is given with one term missing. Choose the correct alternative from the given ones that will complete the series. 1, 3, 7, 5, 13, 7, _, _

  1. 9, 19

  2. 19, 9

  3. 11, 9

  4. 9, 11
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The series has two interleaved patterns. Odd positions (1st, 3rd, 5th, 7th) increase by 6: 1, 7, 13, 19. Even positions (2nd, 4th, 6th, 8th) increase by 2: 3, 5, 7, 9. Therefore, the next two terms are 19 and 9.

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