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A satellite is to be placed in equatoria...

A satellite is to be placed in equatorial geostationary orbit around earth for communication. Find out the minimum number of satellites that are needed to cover entire earth so that aat least one satellite is visible from any point on the equator. [`M = 6 xx 10^24 kg, R = 6400 km, T = 24 h, G = 6.67 xx 10^-11` SI units]

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