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 Assertion (A): Fracture surface of grey cast iron is dark

         Reason (R): Failure takes place along the weak cementite plates.                

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

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

(c) A is true but is false

(d) A is false but R is true         

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