Question

Choose the number pair which is different from the other:

• A. \(181 - 48\)
• B. \(170 - 55\)
• C. \(131 - 42\)
• D. \(80 - 25\)

Hint:

In odd-one-out number pair problems, look for hidden patterns in ratios or differences. The option that breaks the pattern is your answer.

Answer 1

The Correct Option is A

Let’s examine each pair by calculating the difference:
\[ \begin{aligned} \text{(A) } & 181 - 48 = 133 \\ \text{(B) } & 170 - 55 = 115\\ \text{(C) } & 131 - 42 = 89 \\ \text{(D) } & 80 - 25 = 55 \end{aligned} \] Now examine the divisibility pattern:
B: \(115 = 5 \times 23\)
C: \(89\) is a prime number
D: \(55 = 5 \times 11\)
These are relatively close in structure.
But A: \(133 = 7 \times 19\) — significantly different and not following any emerging pattern.
Alternatively, consider the ratios:
B: \(170 \div 55 \approx 3.09\)
C: \(131 \div 42 \approx 3.12\)
D: \(80 \div 25 = 3.2\)
A: \(181 \div 48 \approx 3.77\)
Clearly, A is the odd one out.