document.write( "Question 1202678: Cathy owns a collection of 25 ballpoint pens of which 6 are pilot. If 2 ballpoints are selected at random, find the probability that both are made by pilot. \n" ); document.write( "
Algebra.Com's Answer #837686 by greenestamps(13200)![]() ![]() You can put this solution on YOUR website! \n" ); document.write( "The two responses you have already received both use an elementary method for finding the answer. \n" ); document.write( "That is one of two basic methods for solving problems like this. For more complicated similar problems, you will usually want to know the second basic method. \n" ); document.write( "We are choosing 2 of the 6 pens that are made by pilot and 0 of the other 19 pens. \n" ); document.write( "The total number of ways of choosing 2 of the 25 pens is C(25,2). \n" ); document.write( "The number of ways of choosing 2 of the 6 pilot pens and none of the other 19 pens is C(6,2)*C(19,0). \n" ); document.write( "The probability of choosing 2 of the 6 pilot pens is \n" ); document.write( " \n" ); document.write( "ANSWER: 1/20 \n" ); document.write( " \n" ); document.write( " |