Coin Toss Experiment Problem

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consider an experiment of tossing a coin.heads appear about once out of every three tosses. if this experiment is repeated, what is the probability of the event that heads appear exactly twice during the first five tosses

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What you are looking for is a direct application of the binomial distribution: $$ P(X=k)={n\choose k}p^k(1-p)^{n-k} $$ In your case, $X$ would count the number of heads, $p=\frac{1}{3}$ is the probability of heads appearing, $n=5$ is the total number of tosses and $k=2$ is the number of heads that we would like to get.