There are some unbiased coins (equal probability of having head and tail when tossed). Initially, all the coins are tossed. The following steps are followed after that:
- turn all the Head up coins to Tail.
- toss all the Tail up coins.
Find the probability of finding the a coin Head up after 'n' pairs of steps, ( or to frame it differently, find the number of coins with Head up) (Hint: think in terms of ratio)
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