Question 1047946: Hi, my teacher gave us this problem for homework, and I'm having a little bit of trouble solving it:
Bob has 3 ways to get to work (train, car, and teleport). He independently chooses 1 of the 3 to and from work. What is the probability that he teleports at least once during a day?
Answer by ikleyn(52786)   (Show Source):
You can put this solution on YOUR website! .
Hi, my teacher gave us this problem for homework, and I'm having a little bit of trouble solving it:
Bob has 3 ways to get to work (train, car, and teleport). He independently chooses 1 of the 3 to and from work.
What is the probability that he teleports at least once during a day?
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Let me use T= train, C = car and P = teleport for brevity.
The table of possible outcomes is
To work To home
T T
T C
T P (*)
C T
C C
C P (*)
P T (*)
P C (*)
P P (*)
The number of lines where you see the symbol P is 5. (They are marked as (*)).
So, the probability under the question is  .
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