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Assertion: Converging passage is used for feeding luquid metal into a mould

Reason: Inhalation of air promotes blow holes in casting

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 the correct explanation of A.

c. A is true but R is false.

d. A is false but R is true.

e. Both A and R are false.

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