Choose the pair of numbers which is different from others, among the given options.

(100, 30)

The correct answer is Option (3) → (100, 30)

Let’s look for a common numerical property in each pair.

Check the HCF (GCD) of each pair:

• (140, 45) → HCF = 5
• (110, 35) → HCF = 5
• (100, 30) → HCF = 10
• (80, 25) → HCF = 5

Observation

All pairs have HCF = 5, except (100, 30) which has HCF = 10.