I was watching a clip from IQ, in which the protagonist has to take a multiple-choice test. His physicist friends are helping him out, of course. But I tried freezing the frame on a few questions, such as the one below.
It says: Rebecca has a coin which is twice as likely to come up heads than tails. What is the probability of her flipping four consecutive heads?
Shouldn't the answer be 16/81? Which is option D? Why is the fool selecting A?