If a number is divisible by 5 and 6 both, then it may not be divisible by

1. 10

2. 15

3. 30

4. 60

The number of common prime factors of 60, 75 and 105 is

1. 2

2. 3

3. 4

4. 5

The LCM of 30 and 45 is

1. 15

2. 30

3. 45

4. 90

If HCF of two numbers is 15 and their product is 1575, then their LCM is

1. 15

2. 105

3. 525

4. 1575