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If A : B = 2 : 3, B : C = 3 : 4 and C : D = 3 : 5 then value of A : B : C : D is:
A:B=2:3 ,B:C=3:4 ,C:D=3:5
A:B:C=2:3:4 C:D=3:5
A:B:C=6:9:12 C:D=12:20
A:B:C:D=6:9:12:20
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