document.write( "Question 1050563: Suppose Set B contains 69 elements and the total number elements in either Set A or Set B is 107. If the Sets A and B have 13 elements in common, how many elements are contained in set A?\r
\n" ); document.write( "\n" ); document.write( "The answer I have is 138 but it's wrough please help \n" ); document.write( "

Algebra.Com's Answer #666137 by MathLover1(20850) $\"\"$ $\"About$

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\n" ); document.write( "\n" ); document.write( "if set $\"B+\"$ contains $\"69\"$ elements, $\"n%28B%29=69\"$ \r
\n" ); document.write( "\n" ); document.write( "total number elements in either Set $\"A\"$ or $\"+B\"$ , then $\"n\"$ ( $\"A\"$ U $\"B\"$ ) = $\"107\"$ \r
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\n" ); document.write( "\n" ); document.write( "then $\"n\"$ ( $\"A\"$ U $\"B\"$ )- $\"n%28B%29\"$ = $\"107-69\"$ = $\"38\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"38\"$ is a number of elements that are only in $\"+A\"$ but not in ( $\"A\"$ intersection $\"B\"$ )\r
\n" ); document.write( "\n" ); document.write( "since given that ( $\"A\"$ intersection $\"B\"$ )= $\"13\"$ , you add it to $\"38\"$ and you will get $\"n\"$ ( $\"A=38%2B13=51\"$ \r
\n" ); document.write( "\n" ); document.write( "check:\r
\n" ); document.write( "\n" ); document.write( " $\"n\"$ ( $\"A\"$ U $\"B\"$ ) = $\"n%28A%29+-n%28B%29-13=%2851%2B69%29-13=120-13=107\"$ \r
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