यदि a ∶ b = 1 ∶ 2 और b ∶ c = 2 ∶ 1 है, तो a ∶ b ∶ c का मान क्या है?

1
∶ 4 ∶ 1
2
∶ 1 ∶ 2
3
∶ 1 ∶ 1
4
∶ 2 ∶ 1

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