Earth, Mars, Saturn, Uranus and Neptune revolve around the sun. Earth takes 1 year, Mars 2 years, Saturn 30 years, Uranus 84 years, and Neptune 165 years to make a complete revolution. How often will Saturn and Mars appear in the same direction in the night sky as seen from Earth? (Hint: Find the LCM of 30 and 2.) Saturn and Mars will appear in the same direction in the night sky every years.
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