The HCF and LCM of two numbers m and n are respectively 6 and 210. If m + n = 60, then 1/m + 1/n is equal to	Choose the correct choice from the following: A) 1 / 35 B) 3 / 35 C) 1 / 21 D) 2 / 35 E) none

Rationale: "answer we have , m x n = 6 x 210 = 1260 â ˆ ´ 1 / m + 1 / n = ( m + n ) / mn = 60 / 1260 = 1 / 21 correct option : c"
Answer: C