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#1 2008-11-20 06:05:45
- cshell
- Guest
problem...
there is 30% chance of winning lotto; what is the chance of not winning?
#2 2008-11-20 07:07:37
- mathsyperson
- Moderator
- Registered: 2005-06-22
- Posts: 4,900
Re: problem...
Something will always happen or not happen, so the chance of that is 100%.
Therefore, the chance of something happening, plus the chance of it not happening is 100%.
You've been told that the chance of winning the lottery is 30%.
So, the chance of not winning must be 100% - 30% = 70%.
Why did the vector cross the road?
It wanted to be normal.
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