Question

Identify the odd one out from the options given below :

• A. 6.40, 9.60, 19.20, 12.80
• B. 1.0, 1.50, 3, 2
• C. 0.5, 0.75, 1.50, 1.0
• D. 0.40, 0.60, 1.20, 0.80
• E. 0.50, 1.50, 3.0, 0.25

Hint:

In odd-one-out questions with number sets, check if each set follows a constant ratio or arithmetic difference. The set that breaks both tests is the odd one out.

Answer 1

Answer: (E)

Step 1: Understanding the Concept:
Find the set of four numbers that does not follow the same pattern as the others.

Step 2: Detailed Explanation:
Option (A): 6.4, 9.6, 12.8, 19.2 $\to$ ratios: $\frac{9.6}{6.4}=1.5$, $\frac{12.8}{9.6}\approx1.33$, $\frac{19.2}{12.8}=1.5$ -- not consistent. Check as multiples of 3.2: $2\times3.2=6.4$, $3\times3.2=9.6$, $4\times3.2=12.8$, $6\times3.2=19.2$ -- multiples 2,3,4,6 (skip 5).
Option (E): 0.5, 1.5, 3.0, 0.25 $\to$ ratios $1.5/0.5=3$, $3.0/1.5=2$, $0.25/3.0\approx0.08$ -- very inconsistent. This set has no recognisable consistent pattern unlike the others. The official answer is (E).

Step 3: Final Answer:
The odd one out is (E) 0.50, 1.50, 3.0, 0.25.