# set (math)

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A class of 47 students took examination in algebra and geometry. If 29 passed algebra and 26 passed geometry and 4 failed in both subjects, how many passed both subjects?

• set (math) -

47-29=18 failed algebra
47-26=21 failed geometry
4 failed both

18+21-4=35 failed something
so, 47-35=12 passed both

• set (math) -

• set (math) -

12

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