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An epicyclic gear train is shown schematically in the adjacent figure The sun gear 2 on the input shaft is a 20 teeth external gear. The planet gear 3 is a 40 teeth external gear. The ring gear 5 is a 100 teeth internal gear. The ring gear 5 is fixed and the gear 2 is rotating at 50 rpm ccw (ccw=counter-clockwise and cw=clockwise) The arm 4 attached to the output shaft will rotate at


 (A) 10 rpm ccw

 (B) 10 rpm cw

(C) 12 rpm cw

 (D) 12 rpm ccw

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