Which types of numbers are not coprime?
Show answer & explanation
Correct answer: A
Explanation
The correct answer is Option 1 i.e. Any two consecutive even numbers.
As we know,
- Since all even numbers are a factor of 2, two even numbers can never form a coprime pair.
- Numbers 0 and 5 are not coprime if that is the unit digit for both.
- For instance, because 10 and 15 are divisible by 5 (i.e., have an HCF of 5) they are not coprime.