Question

Common prime factors of 36, 60 and 72 are

(a) 2 x 2

(b) 2 x 3

(c) 3 x 3

(d) 3 x 2 x 2

Answer 1

(d) 3 x 2 x 2

Prime factors of 36 are 2 x 2 x 3 x 3

Prime factors of 60 are 2 x 2 x 3 x 5

Prime factors of 72 are 2 x 2 x 2 x 3 x 3

∴ Common prime factors are 2 x 2 x 3