Question

Common prime factors of 30 and 250 are

(a) 2 x 5

(b) 3 x 5

(c) 2 x 3 x 5

(d) 5 x 5

Answer 1

(a) 2 x 5

Prime factors of 30 are 2 x 3 x 5

Prime factors of 250 are 5 x 5 x 5 x 2

∴ Common prime factors are 2 x 5.