# 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??

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.

• math -

Add 12, 8, and three and see what is left over. The left over is the answer.

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