Frannie tosses a coin 12 times and gets five heads and seven tails. In how many ways

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Frannie tosses a coin 12 times and gets five heads and seven tails. In how many ways can these tosses result in
(a) Two runs of heads and one run of tails;
(b) Three runs;
(c) Four runs;
(d) Five runs;
(e) Six runs;
(f) Equal numbers of runs of heads and runs of tails?
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