document.write( "Question 224818: How many ways can three letters be chosen from the letters A,B,C,D, and E? \n" ); document.write( "
Algebra.Com's Answer #167944 by Alan3354(69443)![]() ![]() You can put this solution on YOUR website! How many ways can three letters be chosen from the letters A,B,C,D, and E \n" ); document.write( "--------------- \n" ); document.write( "If repeats are allowed, eg AAA, it's 5*5*5 = 125 \n" ); document.write( "-------------- \n" ); document.write( "If letters can't be reused, it's 5*4*3 = 60 \n" ); document.write( "The 1st letter is 1 of 5, then 1/4, then 1/3. \n" ); document.write( "This is 5!/(5-3)! = 120/2 = 60 \n" ); document.write( "--------------- \n" ); document.write( "If order doesn't matter, ie, if ABC is the same as ACB, then it's \n" ); document.write( "5*4*3/(3*2*1) = 10 \n" ); document.write( " \n" ); document.write( " |