What are the chances of flipping a coin and getting 100 heads in a row?

The chances of flipping a fair coin and getting 100 heads in a row is extremely low. Each flip has a 50% chance of being heads, so the probability of getting heads 100 times consecutively is (1/2) raised to the power of 100, which is approximately 1 in 1.27 quintillion (or 1 in 2^100). This makes such an outcome highly improbable.