Multiple choice general knowledge math & puzzles

series...1,2,3,5,7,?

  1. 9

  2. 11

  3. 13

  4. 15
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The series 1, 2, 3, 5, 7 lists prime numbers in ascending order. The next prime number after 7 is 11. Option A (9) is not prime (3×3), C (13) skips 11, and D (15) is not prime (3×5).

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