An unfair coin with Pr[H]=23 is flipped. What is the probability of a tail?
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Do you mean p = .23 for heads and if so then tails will come up at p = .77
Perhaps I do not understand your wording.
The probability of all possible outcomes must always sum to 1.
I think in your question the pr(H)= 2/3 (since it cannot be greater than 1 it cannot be 23) which would mean the probability of a tail is 1 - pr(H)= 1-(2/3) = 1/3
Hope this helps!