document.write( "Question 1106137: A student's pencil case contains six red pencils and eight black pencils. If seven pencils are picked at random, what is the probability that exactly three of them are black? \n" ); document.write( "
Algebra.Com's Answer #721065 by Boreal(15235)\"\" \"About 
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Total number of ways to choose 7 from 14 is 14C7 (denominator)
\n" ); document.write( "numerator are ways to choose 3 black pencils, 8C3, multiplied by ways to choose 4 red pencils, 6C4.
\n" ); document.write( "That is 56*15=840 divided by 3432
\n" ); document.write( "probability is 0.245
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