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Multiple choice

Which value is wrong in the given series. $3, 4, 7.5, 19, 45, 138$

  1. 4

  2. 7.5

  3. 19

  4. 45

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The series should follow: ×1+1, ×2-0.5, ×2+0.5, ×2-1, ... Starting from 3: 3×1+1=4, 4×2-0.5=7.5, 7.5×2+0.5=15.5 (not 19), 15.5×2-1=30, 30×2+... The value 19 breaks the pattern.

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