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A gating ratio of 1:2:4 is used to design the gating system for magnesium alloy casting. This gating ratio refers to the cross section areas of the various gating elements as given below                         

1. down sprue    

2. runner bar

3. Ingate

The correct sequence of the above elements in the ratio 1:2:4 is

(a) 1,2 and 3                   (b) 1,3 and 2

(c) 2,3 and 1                   (d) 3,1 and 2

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