document.write( "Question 338079: Name all even composite numbers FROM 60-70 ,INCLUSIVE
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document.write( "PLEASE ANSWER I REALLY COULD NOT GET THIS :) \n" );
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Algebra.Com's Answer #242372 by vleith(2983)![]() ![]() ![]() You can put this solution on YOUR website! What are the prime numbers between 60 and 70?\r \n" ); document.write( "\n" ); document.write( "All even numbers are not prime \n" ); document.write( "That leaves 61, 63, 65, 67, 69 to investigate \n" ); document.write( "65 ends in 5, so it is divisible by 5 \n" ); document.write( "63, 66 and 69 have digits that all sum to a number divisible by 3 (9,12 and 15). so they are not prime \n" ); document.write( "That leaves 61 and 67. They are not divisible by 7 or 11. They are prime \n" ); document.write( "So how many composite numbers, inclusive \n" ); document.write( "60, 62, 63, 64, 65, 66, 68, 69, 70 \n" ); document.write( "Nine total\r \n" ); document.write( "\n" ); document.write( "http://en.wikipedia.org/wiki/Composite_number \n" ); document.write( " |