P ∶ Q ∶ R = 9 ∶ 10 ∶ 11 అయితే, (P + Q) ∶ (Q + R) ∶ (R + P) విలువ ఎంత?

1
19 ∶ 21 ∶ 20
2
19 ∶ 21 ∶ 19
3
19 ∶ 21 ∶ 22
4
19 ∶ 21 ∶ 23

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