In an examination‚18 candidate passed mathematics‚17 candidates passed physics, 11 candidates passed both subjects and1 candidate failed both subjects find. The number of candidates that passed mathematics only. The number of candidates that passed physics only. The total number of candidates that sat for the examination

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  1. If there were x candidates, only x-1 passed something
    18 + 17 - 11 = x-1
    18-11 passed only math

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  4. I don't understand it

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