36 has _________ number of prime factors.
3
1
4
2
Prime factorisation: 36=22×32 Here, the prime factors are prime are 2 and 3. Hence 36 has two prime factors.
A number a has 3 as its smallest prime factor, and another number b has 5 as its smallest prime factor. What is the smallest prime factor of the number a+b?
A number a has 7 as its smallest prime factor, and another number b has 3 as its smallest prime factor. What is the smallest prime factor of the number a−b?