Question

You toss a coin four times. the first, second and third toss are heads. what's the probability of the fourth toss also being heads?

Answer 1

they are independent, so it will be 50%.

Answer 2

If the coin is a fair one, then the probability of each toss being heads is 0.5 or 50%. If the coin is not fair, then more information is needed to answer the question.