document.write( "Question 748152: there are 3 airports. one flight flies from one airport to each of the other airports every day. how many flights are there in each day \n" ); document.write( "

Algebra.Com's Answer #455353 by Edwin McCravy(20054) $\"\"$ $\"About$

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there are 3 airports. one flight flies from one airport to each of the other airports every day. how many flights are there in each day
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document.write( "Each flight has an AIRPORT OF DEPARTURE and an AIRPORT OF ARRIVAL.  You can\r\n" );
document.write( "choose the AIRPORT OF DEPARTURE in 3 ways and for everyone of those 3 ways,\r\n" );
document.write( "there remain 2 ways to choose the AIRPORT OF ARRIVAL.  That's 3×2 or 6 ways.  \r\n" );
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document.write( "This is a permutation because ORDER MATTERS!  The order of going FROM airport A\r\n" );
document.write( "TO airport B is different from reversing the order and going from Airport B to\r\n" );
document.write( "Airport A.  ORDER MATTERS, so it's P(3,3) = 3! = 3×2×1 = 6.   They are\r\n" );
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document.write( "1. Airport A to Airport B\r\n" );
document.write( "2. Airport A to Airport C\r\n" );
document.write( "3. Airport B to Airport A\r\n" );
document.write( "4. Airport B to Airport C\r\n" );
document.write( "5. Airport C to Airport A\r\n" );
document.write( "6. Airport C to Airport B \r\n" );
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document.write( "Edwin

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