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Hi, i'm david and i'm here to help you answer your question.
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Now let me bring up your question here.
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In this question we discuss about the probability and the difference between the intersection and the union.
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Here in a group of the 100 students, 40 are taking algebra, so i will denote algebra by the letter a.
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30 are taking biology, b for the biology, and 20 are taking both algebra and biology.
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So the first statement here can be converted into the probability.
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Now we will have probability of the a, it will equal to.
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We count there are 40 taking algebra out of the total 100 students.
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Therefore we have the 40 over 100 equal to the 4 over 10, so equal to 2 over 5.
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Now next, the second statement here, 30 are taking biology.
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So we convert that into the probability b.
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It will be the count will be 30 divided by the total.
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So we have the 3 out of 10...