Multiple choice

Find the wrong number in the following number series. $17, 18, 22, 33, 47, 72, 108, 157$

  1. $22$
  2. $18$
  3. $108$
  4. $33$

  5. None of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Pattern: add consecutive prime squares starting from 1²: 17+1=18, 18+4=22, 22+9=31 ✗ (given 33). The error is at 33. Continuing correctly: 22+9=31, 31+16=47 ✓, 47+25=72 ✓, 72+36=108 ✓, 108+49=157 ✓. Option D (33) is wrong.

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