A ∶ B = 5 ∶ 6 మరియు B ∶ C = 6 ∶ 7 అయితే, (A + B) ∶ (B + C) ∶ (C + A) :

1
12 ∶ 13 ∶ 11
2
11 ∶ 13 ∶ 12
3
11 ∶ 12 ∶ 13
4
13 ∶ 11 ∶ 12

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