Equal masses of two substance of densiti...

Equal masses of two substance of densities `rho_(1) and rho_(2)` are mixed together. What is the density of the mixture?

`1/2(rho_1+rho_2)`

`(rho_1+rho_2)`

`sqrt(rho_1.rho_2)`

`(rho_1.rho_2)/((rho_1+rho_2))`

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