जर a ∶ b = 2 ∶ 3 आणि b ∶ c = 4 ∶ 7, तर 2a ∶ 3b ∶ c काय आहे?

1
2 ∶ 3 ∶ 14
2
8 ∶ 36 ∶ 21
3
16 ∶ 36 ∶ 21
4
8 ∶ 12 ∶ 21

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