My probability is failing me.  Could someone answer this?

I have a very biased coin that comes up 2/3 heads, 1/3 tails. I want to do an experiment of n coin flips.

The probability that all are heads is (2/3)^n, right?

What I'm interested is the related question: Lets suppose I repeat the experiment t times. How likely am I to get all heads once in a series of t sets of n flips?

    -- Owen



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