Answer to Question #12447 in Combinatorics | Number Theory for phoebe
a)both sports? b)sqaush? c)tennis?
t + s + n - b = 38 ==> b = t + s + n - 38 = 19 + 21 + 10 - 38 = 50 - 38 = 12.
So, 12 children play both sports, 21 play squash and 19 play tennis.
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