Question 230580
how many sequences of four heads and three tails can be obtained from seven coin tosses? 
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Just determine the number of ways to place the 4 heads; the tails will
take care of themselves the same number of ways.
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Ans: 7C4 = 7*6*5*4/1*2*3*4 = 7C3 = 7*6*5/1*2*3 = 35
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Cheers,
Stan H.