document.write( "Question 1160576: A fair coin is tossed repeatedly until a head is obtained. The probability that the coin has to be tossed at least four times is...........................................?
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Algebra.Com's Answer #783891 by Edwin McCravy(20060) $\"\"$ $\"About$

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document.write( "1-P(H)-P(TH)-P(TTH) = 1-0.5-0.5²-0.5³ = 1-0.5-0.25-0.125 = 0.125\r\n" );
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document.write( "Edwin

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