SOLUTION: If there is one folder per pet and Valerie selected a folder at random from yesterday's stack of folders, what would be the chances she would get a cat or bird's chart? Give answer

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Question 312763: If there is one folder per pet and Valerie selected a folder at random from yesterday's stack of folders, what would be the chances she would get a cat or bird's chart? Give answer as a fraction in lowest terms?
Found 2 solutions by stanbon, solver91311:
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
If there is one folder per pet and Valerie selected a folder at random from yesterday's stack of folders, what would be the chances she would get a cat or bird's chart? Give answer as a fraction in lowest terms?
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You need some numbers in your post.
Cheers,
Stan H.

Answer by solver91311(24713) About Me  (Show Source):
You can put this solution on YOUR website!


Let represent the number of cat charts plus the number of bird charts in the stack. Let represent the number of dog plus snake plus iguana plus horse plus alpaca plus...everything else charts in the stack.

That means that is the total number of folders in the stack.

The probability of getting either a cat's or a bird's chart is:



Reducing it to lowest terms is on you once you supply the actual numbers.

John