#### If the system of linear equations         has a non­-zero solution, then Option 1) are in G.P. Option 2) are in H.P. Option 3) satisfy  Option 4) are in A.P.

As we learnt in

Harmonic mean (HM) of two numbers a and b -

-

Dividing by abc we get,

Therefore, a, b, c are in HP.

Option 1)

are in G.P.

This option is incorrect.

Option 2)

are in H.P.

This option is correct.

Option 3)

satisfy

This option is incorrect.

Option 4)

are in A.P.

This option is incorrect.