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	Select the correct option:	A) 1 / 35	B) 3 / 35	C) 5 / 37	D) 2 / 35	E) none

Rationale: 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 : d
Answer: D