Question

The probability that a fair coin tossed 10 times will land heads up on all ten tosses is 1 out of _?
2
10
2^10

Answer 1

to find the probability of two independent events, you can multiply the probabilities
the probability of getting heads on the first toss is 1/2
the probability of getting heads on the second toss is 1/2
the probability of getting heads on each toss is independent from the other toss

the probability of getting heads on both tosses is then (1/2)*(1/2)=1/4
the probability of getting heads on three tosses is (1/2)*(1/2)*(1/2)
see the pattern?