Probabilities
posted by Anna .
In a cookie jar, there are 6 chocolate cookies and 8 oatmeal cookies. I take out the cookies one at a time and proceed to eat them. The probability that the 7th cookie that I eat is a chocolate cookie is a/b, where a and b are positive coprime integers. What is the value of a+b?

Probabilities 
Pit
10 (3/7)
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I don't know how to make an equation for this?