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An integer is chosen at random from the ...

An integer is chosen at random from the first 100 positive integers. What is the probability that the integer chosen is a prime or multiple of 8?

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The correct Answer is:
`therefore P(A " or "B) = (n(A) + n(B))/(n(S)) = 37/100`
[`because "A and B are mutually exclusive events," A nn B = phi`]
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