If (a + b + c) d = 3 1, (b + c + d) a = 5 1 and, (c + d + a) b = 2 1 then find a b c d. 

1
7 ∶ 2 ∶ 3 ∶ 4
2
2 ∶ 4 ∶ 3 ∶ 3
3
5 ∶ 4 ∶ 9 ∶ 6
4
3 ∶ 9 ∶ 6 ∶ 5

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