(a + b + c) ∶ d = 5 ∶ 1, (b + c + d) ∶ a = 7 ∶ 1 మరియు (c + d + a) ∶ b = 3 ∶ 1 అయితే a ∶ b ∶ c ∶ d కనుగొనండి.

1
1 ∶ 2 ∶ 3 ∶ 4
2
3 6 11
3
2 ∶ 4 ∶ 9 ∶ 6
4
 3 ∶ 9 ∶ 6 ∶ 5

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