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If 75 % of a class answered the first question on a certain test correctly, 55 percent answered the second question on...
Solution
Let, the total number of students in the class = 100Then the number of students who answered first question correctly is = n(1) = 75Then the number of students who answered second question correctly is= n(2) = 55Then the number...
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Keynote
n(a U b) = n(a) + n(b) − n(a ∩ b)
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