Civil Services UPSC EPFO (APFC) Mock Test 2023 Quantitative Aptitude Progression Harmonic Progression
If x is the harmonic mean between y and z, then which one of the following is correct ?
1
xy + xz - yz = 0
2
xy + xz – 2yz = 0
3
xy + xz + yz = 0
4
xy + xz – 4yz = 0