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