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Let A be the event in which the selected student studies Mathematics and B be the event in which the selected student studies Biology.
Accordingly, P(A) = 40% = =
P(B) = 30%
P(A and B) = 10%
We know that P(A or B) = P(A) + P(B) – P(A and B)
Thus, the probability that the selected student will be studying Mathematics or Biology is 0.6.
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