Four fair coins are flipped. If the outcomes are assumed independent, what is the probability that two heads and two tails are obtained.
The probability of success for either heads or tails is the same which is of course $\frac{1}{2}$.
I'm unsure of what to go from here, however, I know it has to incorporate the binomial distribution somehow. I also know, the general rule of thumb when you see the word "and" in a probability question, you multiply them.
Any help would be appreciated!