Multiple choice

A series is given with one term missing. Choose the correct alternative from the given ones. $17, 43, 81, 131, ?$

  1. $300$
  2. $193$
  3. $375$
  4. $468$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The series follows the pattern n² + 1 where n represents prime numbers in order: 4² + 1 = 17, 6² + 1 = 37 (not 43 - pattern breaks), 9² + 1 = 82 (not 81). Let me re-examine: The actual pattern is that differences increase by 8 each time: 43-17=26, 81-43=38, 131-81=50, so next difference is 62, giving 131+62=193. This is correct.

Keep practicing — related questions