If P ∶ Q = 1 ∶ 3, Q ∶ R = 3 ∶ 4 and R ∶ S = 2 ∶ 1, then what is the value of P ∶ S?

1
3 ∶ 1
2
2 ∶ 1
3
1 ∶ 2
4
3 ∶ 2

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