document.write( "Question 1129474: Question about probability. \r
\n" ); document.write( "\n" ); document.write( "If a question asks, what is the number of sequences of heads or tails if a coin is flipped 7 times, what is it asking for? I am confused if this is permutation or combination.\r
\n" ); document.write( "\n" ); document.write( "Am I to find the different ways each flip could go if done 7 times and then add the different sets together?\r
\n" ); document.write( "\n" ); document.write( "i.e.\r
\n" ); document.write( "\n" ); document.write( "HTTTTTT+HHTTTTT etc.\r
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Algebra.Com's Answer #746061 by ikleyn(52788) $\"\"$ $\"About$

You can put this solution on YOUR website!
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document.write( "The number that the question asks for is   = 128.\r\n" );
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document.write( "Each sequence is the word of 7 symbols, written using only TWO symbols H or T.\r\n" );
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document.write( "So, each position of such a 7-symbols word is the letter H or T.\r\n" );
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document.write( "And the full number of these words (= of these sequences) is   = 128. \r\n" );
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document.write( "It is the number the question is asking for.      ANSWER\r\n" );
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