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out of 40 people,17 have brothers,22 have sisters and 9 have both.how many people have neither brothers nor sisters

  • math -

    17 - 9 = 8 have only brothers
    22 - 9 = 13 have only sisters
    9 have both brothers and sisters
    40 - 8 - 13 - 9 = 10 have neither.

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