Problem:
Harold tosses a nickel four times. The probability that he gets at least as many heads as tails is
Answer Choices:
A.
B.
C.
D.
E.
Solution:
There are possible outcomes: , , , , , , , , , , and , , , , . The first eleven have at least as many heads as tails. The probability is .
Answer: .
The problems on this page are the property of the MAA's American Mathematics Competitions