document.write( "Question 989192: True or false\r
\n" ); document.write( "\n" ); document.write( "1. {Φ} is a subset of the null set Φ.
\n" ); document.write( "2. The null set is a subset of itself.
\n" ); document.write( "3. The set {x | x is a positive divisor of 15} and the set {15x | x is counting number} are disjoint sets.
\n" ); document.write( "4. {1, 2, 3} = {x is a prime number | x divides 6}\r
\n" ); document.write( "\n" ); document.write( "please help
\n" ); document.write( "

Algebra.Com's Answer #609587 by solver91311(24713)\"\" \"About 
You can put this solution on YOUR website!
\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "Number 4 is false. 1 is not a prime number.\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "John
\n" ); document.write( "
\n" ); document.write( "My calculator said it, I believe it, that settles it\r
\n" ); document.write( "\n" ); document.write( "
\n" ); document.write( "
\n" );