document.write( "Question 478443: how many positive integers less than 1000 are?divisible by7?,divisible by 7 but not by 11?,divisible by both 7 and 11?,divisible by either 7 or 11?,divisible by exactly by one of 7 and 11?\r
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Algebra.Com's Answer #327813 by robertb(5830)\"\" \"About 
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The number of positive integers n less than 1000 that are divisible by 7:
\n" ); document.write( "[1000/7] = 142\r
\n" ); document.write( "\n" ); document.write( "The number of positive integers divisible by both 7 and 11 are those that are divisible by 77:
\n" ); document.write( "[1000/77] = 12\r
\n" ); document.write( "\n" ); document.write( "==> The number of positive integers divisible by 7 but not by 11 is 142 - 12 = 130.\r
\n" ); document.write( "\n" ); document.write( "The number of positive integers less than 1000 that are divisible by 11:
\n" ); document.write( "[1000/11] = 90
\n" ); document.write( "==>the number of positive integers less than 1000 that are divisible by either 7 or 11 is 142 + 90 - 12 = 220.\r
\n" ); document.write( "\n" ); document.write( "==>the number of positive integers less than 1000 that are divisible by exactly by one of 7 and 11 is 220 - 12 = 208.
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