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28 December, 12:08

There are 250 students taking band, chorus, or both. If there are 180 students taking band and 60 students in both band and chorus, how many students are only in chorus?

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  1. 28 December, 14:01
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    A-students taking band

    B-students taking chorus

    |AuB| = 250

    |A| = 180

    [AnB] = 60

    |AuB| = |A| + |B| - |AnB|

    |B| = |AuB| - |A| + |AnB| = 250 - 180 + 60 = 130

    ans: 130 students in chorus only
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