document.write( "Question 357338: An amusement park has 20 different rides. You want to ride at least 15 of them. How many different combinations are there to consider? \n" ); document.write( "
Algebra.Com's Answer #255222 by edjones(8007)\"\" \"About 
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nCr=20C15=20!/((20-15)!15!=20!/(5!*15!)=15504
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