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Sum of a – b + ab, b + c – bc and c – a – ac

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Sum of a – b + ab, b + c – bc and c – a – ac is
Options:

(a) 2c + ab – ac – bc

(b) 2c – ab – ac – bc

(c) 2c + ab + ac + bc

(d) 2c – ab + ac + bc

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