Solution: 2015 Fall Midterm - 15
Author: Michiel SmidQuestion
You flip a fair coin 7 times. Define the event
- A = "the result of the first flip is equal to the result of the 7-th flip".
(a)
$1/2$
(b)
$\frac{2^5 + 2}{2^7}$
(c)
$1/4$
(d)
$1/3$
Solution
There are 4 possible total outcomes for the first and last flip:
- HH
- HT
- TH
- TT
|A| = 2
$Pr(A) = \frac{2}{4} = \frac{1}{2}$