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If two liquids of same masses but densities \( \rho_{1} \) and \( \rho_{2} \) respectively are mixed, then density of mixture is given by
(a) \( \rho=\frac{\rho_{1}+\rho_{2}}{2} \)
(b) \( \rho=\frac{\rho_{1}+\rho_{2}}{2 \rho_{1} \rho_{2}} \)
(c) \( \rho=\frac{2 \rho_{\mathrm{I}} \rho_{2}}{\rho_{1}+\rho_{2}} \)
(d) \( \rho=\frac{\rho_{1} \rho_{2}}{\rho_{1}+\rho_{2}} \)
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