Quantitative Aptitude Progression Harmonic Progression

ଯଦି x ହେଉଛି y ଏବଂ z ମଧ୍ୟରେ ହରାତ୍ମକ ମାଧ୍ୟମାନ, ତେବେ ନିମ୍ନଲିଖିତ ମଧ୍ୟରୁ କେଉଁଟି ସଠିକ୍?

1
xy + xz - yz = 0
2
xy + xz - 2yz = 0 
3
xy + xz + yz = 0
4
xy + xz - 4yz = 0 

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