Choose the pair of numbers which is different from others, among the given options.
Answer & explanation
Correct answer: option 3
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.