document.write( "Question 579978: How would you work the problem- what is the probability that a number selected at random from the firs 600 positive integers is divisible by 6 or 9?
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Algebra.Com's Answer #371270 by richard1234(7193) $\"\"$ $\"About$

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Inclusion-exclusion principle. (let n be a number between 1 and 600 inclusive):\r
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\n" ); document.write( "\n" ); document.write( "Note that P(6|n and 9|n) is equivalent to saying P(18|n) since LCM(6,9) = 18.\r
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\n" ); document.write( "\n" ); document.write( "Out of the integers between 1 and 600 inclusive, there are 100 integers divisible by 6, 66 divisible by 9, and 33 divisible by 18. Therefore,\r
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