Multiple choice

Which one number is wrong in the given series ? $7, 8, -1, 24, -25, 58, -65$

  1. $24$
  2. $-1$
  3. $58$
  4. $8$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Odd positions: 7, -1, -25, -65 with differences -8, -24, -40 (decreasing by 16 each time). Even positions: 8, 24, 58 should have differences +16, +34 (increasing by 18). But 24-8=16, 58-24=34, so 58 is correct. Wait - rechecking: pattern should be 16, 34, 52... 58 fits.

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