Question : What is the HCF of 12, 18 and 42?

Option 1: 123

Option 2: 12

Option 3: 6

Option 4: 60

Question : Find the HCF of 69, 96, and 99.

Option 1: 3

Option 2: 9

Option 3: 1

Option 4: 6

Question : Find the HCF of 364 and 724.

Option 1: 4

Option 2: 2

Option 3: 6

Option 4: 364

Question : The ratio of two numbers is 3 : 4 and their HCF is 5. Their LCM is:

Option 1: 10

Option 2: 60

Option 3: 15

Option 4: 12

Question : If the sum of two numbers is 60 and their HCF and LCM are 5 and 60, respectively, then the sum of the reciprocals of the numbers will be:

Option 1: $\frac{1}{11}$

Option 2: $\frac{1}{6}$

Option 3: $\frac{1}{4}$

Option 4: $\frac{1}{5}$

Question : What is the HCF of (x⁶ + 1) and (x⁴ - 1)?

Option 1: 1

Option 2: (1 + x)

Option 3: (1 - x²)

Option 4: (1 + x²)