A 21-speed bicycle has seven sprockets at the rear wheel

A 21-speed bicycle has seven sprockets at the rear wheel

A 21-speed bicycle has seven sprockets at the rear wheel and three at the pedal cranks. In which gear is it harder to pedal, a small rear sprocket or a large rear sprocket? Why? In which gear is it harder to pedal, a small front sprocket or a large front sprocket? Why?

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