document.write( "Question 138915: There are 3 red and 7 black marbles in a bag. If I am blindfolded, how many times must I reach in and pull out a marble before I am sure it is a black one? \n" ); document.write( "
Algebra.Com's Answer #101342 by edjones(8007)\"\" \"About 
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4 \n" ); document.write( "
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