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Assertion (A): Shafts supporting helical gears must have only deep groove ball – bearings.                            

Reason (R): Helical gears produce axial thrusts.

(a)  Both A and R are true and R is the correct explanation of A

(b) Both A and R are true but R is not a correct explanation of A

(c) A is true but R is false

(d) A is false but R is true                                                                                 

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