Two stars with the same luminosity form a close binary pair. Show that when they are observed together, the combined apparent magnitude is 0.75 mags less (i.e. brighter) than the sum of the individual magnitudes.

Two stars with the same luminosity form a close binary pair. Show that when they are observed together, the combined apparent magnitude is 0.75 mags less (i.e. brighter) than the sum of the individual magnitudes.

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