Q. 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
✅ Correct Answer: (D)
2/35
Explanation: We have, m x n = 6 x 210 = 1260
∴ 1/m + 1/n = (m + n)/mn = 72/1260 = 4/70 = 2/35
Explanation by: Mahesh Chandra
We have, m x n = 6 x 210 = 1260
∴ 1/m + 1/n = (m + n)/mn = 72/1260 = 4/70 = 2/35
∴ 1/m + 1/n = (m + n)/mn = 72/1260 = 4/70 = 2/35