+0  
 
0
43
1
avatar

The harmonic mean of two positive integers is the reciprocal of the arithmetic mean of their reciprocals. For how many ordered pairs (x, y) of positive integers is the harmonic mean of x and y equal to 20?

 Feb 1, 2021
 #1
avatar
0

x      y

110 11
60 12
35 14
30 15
20 20
15 30
14 35
12 60
11 110

Just count them.

 Feb 1, 2021

71 Online Users

avatar
avatar
avatar
avatar