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Mathematics, 13.12.2021 21:00 lowkeyqueenk

If we flip a coin 20 times, we get sequence of heads and tails. (a) How many sequences of heads and tails are possible.
(b) How many sequences of heads and tails have exactly 5 heads
(c) How many different sequences have at most 2 heads
(d) How many sequences have at least three heads.

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