Question

Find the odd one out from the following series: 5, 10, 20, 40, 100, 150, 200

• A. 10
• B. 40
• C. 100
• D. 150

Hint:

Remember: When solving series puzzles, look for arithmetic or geometric progressions and identify any term that doesn’t follow the pattern.

Answer 1

The Correct Option is D

The series presented is 5, 10, 20, 40, 100, 150, 200. Analysis of the pattern reveals:

• 5 to 10: progression by a factor of 2
• 10 to 20: progression by a factor of 2
• 20 to 40: progression by a factor of 2
• 40 to 100: deviation from multiplication by 2; instead, multiplication by 2.5 occurs
• 100 to 150: an irregular transition
• 150 to 200: an additive increase of 50

A consistent multiplicative rule is expected for this sequence. The abrupt alterations at 150 disrupt this established pattern. Therefore, the outlier identified is 150.