The HCF and LCM of two numbers m and n are respectively 6 and 210. If m + n = 72, then 1/m + 1/n is equal to Choose the correct choice from the following choices
A) 1/35  B) 3/35  C) 5/37  D) 2/35  E) None
Answer   We have, m x n = 6 x 210 = 1260   ∴ 1/m + 1/n = (m + n)/mn = 72/1260 = 4/70 = 2/35   Correct Option: 2/35
<result>D</result>
The HCF and LCM of two numbers m and n are respectively 6 and 210. If m + n = 72, then 1/m + 1/n is equal to