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In the set of 7 numbers listed, two of them are even (24 and 38),
\n" ); document.write( "and the other 5 numbers are odd.
\n" ); document.write( "The difference between two numbers is even (such as 46)
\n" ); document.write( "only if both numbers are even or both numbers are odd.
\n" ); document.write( "So, let's list the odd numbers in order from smallest to greatest
\n" ); document.write( "17
\n" ); document.write( "29
\n" ); document.write( "35
\n" ); document.write( "63
\n" ); document.write( "71
\n" ); document.write( "We do not need to look at all differences.
\n" ); document.write( "We need to find two numbers fairly far appart,
\n" ); document.write( "and not all look promising.
\n" ); document.write( "You could look at approximate differences,
\n" ); document.write( "or you could look at the last digit.
\n" ); document.write( "71-35 and 63-17 are the only promising differences,
\n" ); document.write( "because 71 and 63 are the only numbers large enough to be 46 more than another number in that list,
\n" ); document.write( "and when you calculate the last digit you calculate
\n" ); document.write( "11-5=6 and 13-7=6.
\n" ); document.write( "71-35=36, but