12. निम्नलिखित को जोड़िए-
(i) a+b-c,b+c-a,c+a-b
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=} a + b - c + b + c - a + c + a - b
=} a - a + a + b + b - b - c + c + c
=} 2a - a + 2b - b + 2c - c
=} a + b + c
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