Multiple choice

Find the wrong term in the following number series- 3 7.5 15 37.5 75 175 375

  1. 15

  2. 7.5

  3. 3

  4. 175

  5. None of these

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

The pattern follows: x2, x2+0, x2+7.5, x2+7.5, x2+75, x2+75. Starting with 3: 3x2=7.5, 7.5x2=15, 15x2+7.5=37.5, 37.5x2=75, 75x2+75=225, 225x2=450. The term 175 breaks the pattern - it should be 225. The series alternates between pure doubling (x2) and doubling with adding 7.5 (x2+7.5).