Question

When does the number A become divisible by the number B?

Options

• If the prime factors of A are all included in the prime factorisation of B.

• If the total count of prime factors in A is greater than the total count in B.

• If A is larger than B and they share one common prime factor.

• If the prime factors of B are all included in the prime factorisation of A.

Answer 1

If the prime factors of B are all included in the prime factorisation of A.

Explanation:

This directly states the divisibility rule: A is divisible by B if all prime factors of B are in A's factorisation.