What is the mathematical probability?

Question

If a person guessed a one-sided die correct ten times, then four different colored marbles correct ten times, and then a two-sided coin correct ten times, what would be the mathematical probability of that person being correct consecutively? This is a total of thirty correct consecutive guesses. Please show your work.

Answer 1

P = [(1/1)(1/4)(1/2)]^10 =
1/8^10 =
1/2^30 =
9.3132*10^-10