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math

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there are 30 students in math class.12 belong to the computer lab,and 8 belong to the photography club. 3 belong to both clubs. how many belong to neither??

please help i am confused
thank you..... :)

  • math -

    number( computer OR photo_
    = number(computer) + number(photo) - number(computer AND photo)
    = 12 + 8 - 3 = 17

    That leaves 13 in neither of the clubs.

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