A coin has been dropped three times in a row and each time the face is observed:

Question

What is the probability of getting a head in the second drop?

Answer 1

If it's a fair coin, the probability is 1/2

IF it's a coin with 2 heads, probability = 1 of getting a head

IF it's a coin with 2 tails, probability = 0 of getting a head

IF it's an unfair coin weighted more on one side, so that it comes up more often as heads, maybe 51% of the time, then on any drop the probability will equal 51%. Some people have claimed coins are weighted slightly more to one side, depending on the images on each side.

Answer 2

1/2

No matter how many times it is "dropped", the probability of those previous drops does not affect the probability of the current drop. The probability of getting a head on ANY drop is 1/2.