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1 + 11 =
Solve this simple math problem and enter the result. E.g. for 1+3, enter 4.

Which statement about geostationary orbits is false?

The period of geostationary orbit must be 21 hours

It must be directly above equator

All satellites in a geostationary orbit must have same mass

There is only one possible radius fr.:,- a geostatiOnary orbit