document.write( "Question 359527: what is the probability that an integer from 1 to 10000 is divisible by 10 or 15 \n" ); document.write( "

Algebra.Com's Answer #256663 by Fombitz(32388) $\"\"$ $\"About$

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Look at the numbers divisible by 10.
\n" ); document.write( "{10,20,30,40,50,...,9990,10000)- there are 1000 of them.
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\n" ); document.write( "Look at the numbers divisible by 15.
\n" ); document.write( "{15,30,45,60,75,...,9990) - there are 666 of them.
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\n" ); document.write( "Then look at the ones that are divisble by both 10 and 15.
\n" ); document.write( "{30,60,90,...,9990) - there are 333 of them, you don't want to double count those.
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\n" ); document.write( "P(10 or 15)=P(10)+P(15)-P(both)
\n" ); document.write( "P(10 or 15)= $\"1000%2F10000%2B666%2F10000-333%2F10000\"$
\n" ); document.write( "P(10 or 15)= $\"highlight%281333%2F10000%29\"$ \r
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