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If a substance 'A' dissolves in solution of a mixture of 'B' and 'C' with their respective number of moles in n A , n B and n c , mole fraction C in the solution is

1. B A B n n n +
2. C B A C n n n n − −
3. C B A C n n n n + +
4. C B A C n n n n × ×

Correct answer: C B A C n n n n + +

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