document.write( "Question 1191310: 1. There are 10 doors to a coliseum. In how many ways can a person go in and out if one can enter any door but leave using another door?
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Algebra.Com's Answer #823122 by ikleyn(52781)\"\" \"About 
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\n" ); document.write( "\n" ); document.write( "There are  10*9 = 90  possible different outcomes: \r
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\n" ); document.write( "\n" ); document.write( "        to enter in any of  10  doors and to leave using any of  9  remaining doors.\r
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