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Question : If $a, b$ and $c$ are positive numbers such that $(a^2+b^2):(b^2+c^2):(c^2+a^2)=34:61:45$, then $b - a : c - b : c - a$ = _______.
Option 1: 3 : 2 : 1
Option 2: 2 : 1 : 3
Option 3: 3 : 1 : 2
Option 4: 1 : 2 : 3
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