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Math

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In the Math department of a school, 10 teachers have YM accounts, 13 have GM accounts, and 6 have both accounts. How many teachers in Department have YM or GM accounts?

  • Math - ,

    4 have YM only
    7 have GM only
    6 have both
    11 have one or the other but not both.
    17 have one or the other or both.

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