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)\"\" \"About 
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\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( "\"%28C%286%2C2%29%2AC%2819%2C0%29%29%2FC%2825%2C2%29=15%2F300=1%2F20\"

\n" ); document.write( "ANSWER: 1/20

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