The probability of getting a heads on the first coin flip is 1/2, since there are two equally likely outcomes (heads or tails). Similarly, the probability of getting a tails on the second coin flip is 1/2.
To find the probability of both of these events happening in sequence (getting heads and then tails), we multiply their probabilities:
1/2 * 1/2 = 1/4
So the probability of getting a heads and then a tails when flipping a coin twice is 1/4 or 25%