Subject :IMO Class : Class 4

Which of the following is NOT a common factor of 18 and 27?

A 1

B 3

C 6

D 9

6 is a common factor of 18 as-6 x 3 = 18

Subject :IMO Class : Class 4

Which of the following is NOT a common factor of 18 and 27?

A 1

B 3

C 6

D 9

6 is a common factor of 18 as-6 x 3 = 18