document.write( "Question 843622: Probability\r
\n" ); document.write( "\n" ); document.write( "If you toss seven fair coins, in how many ways can you obtain each result?\r
\n" ); document.write( "\n" ); document.write( "at least 2 heads (\"At least two\" is the complement \"of zero or one\")\r
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Algebra.Com's Answer #508272 by Fombitz(32388) $\"\"$ $\"About$

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There are $\"2%5E7\"$ or 128 possible outcomes.
\n" ); document.write( "One of them has zero heads.
\n" ); document.write( "TTTTTTT
\n" ); document.write( "Seven of them have one head.
\n" ); document.write( "TTTTTTH
\n" ); document.write( "TTTTTHT
\n" ); document.write( "TTTTHTT
\n" ); document.write( "TTTHTTT
\n" ); document.write( "TTHTTTT
\n" ); document.write( "THTTTTT
\n" ); document.write( "HTTTTTT
\n" ); document.write( "So then the probability of \"at least 2 heads\" is,
\n" ); document.write( " $\"P=1-%281%2B7%29%2F128=1-8%2F128=1-1%2F16=15%2F16\"$ \r
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