document.write( "Question 1147962: DERIVE: P(A-B)=P(A)-P(A intersection B) \n" ); document.write( "

Algebra.Com's Answer #769304 by ikleyn(52872) $\"\"$ $\"About$

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\n" ); document.write( "\n" ); document.write( "It is TRUE because (A \ B) = ( A \ (A intersection B) ) at the \"set level\".\r
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\n" ); document.write( "\n" ); document.write( "The last identity (at the set level) you can easily prove/check considering elements from (A \ B) and ( A \ (A intersection B) ).\r
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document.write( "            \"The elements of the subset   (A \ B)   are those and only those \r\n" );
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document.write( "             elements of  A,  that do not belong to  (A intersection B).\"\r\n" );
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