document.write( "Question 9080: which of the numbers 51,81,and111 is a composite number? (P.S thank you so very much) \n" ); document.write( "
Algebra.Com's Answer #4907 by prabhjyot(165)\"\" \"About 
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A composite number is a number that has more than two factors. For example, 6 is a composite number because it has four factors (1, 2, 3, 6). 5 is not a composite number because it has only 2 factors, 1 and 5.\r
\n" ); document.write( "\n" ); document.write( "Add up the digits of your number, if the sum is divisible by 3, your number is composite
\n" ); document.write( "51 = 5+1=6
\n" ); document.write( "6 is divisible by 3
\n" ); document.write( "so 51 is composite number\r
\n" ); document.write( "\n" ); document.write( "81 = 8+1=9
\n" ); document.write( "9 is divisible by 3
\n" ); document.write( " so 81 is composite number\r
\n" ); document.write( "\n" ); document.write( "111= 1+1+1 =3
\n" ); document.write( "3 is divisible by 3
\n" ); document.write( "so 111 is composite number
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