document.write( "Question 590510: You are allowed to omit two out of 12 questions on a quiz. How many ways can you select the questions to omit? Can you please show the break down of the work so I can figure out the formula \n" ); document.write( "
Algebra.Com's Answer #375201 by scott8148(6628)![]() ![]() You can put this solution on YOUR website! there are 12C2 ways of selecting two things from a group of twelve\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "there are 12 ways to select the 1st question and then 11 ways to select the 2nd question \n" ); document.write( "___ BUT ___ selecting question 5 and then 8 is the same as selecting 8 and then 5 (same two questions are omitted)\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "so the number of ways is ___ (12 * 11) / 2 (which is 12C2) \n" ); document.write( " |