Probability suplements, websites? ect?

VonWeber
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Does anyone know/ have an opinion on some good websites or books with beginner level probablility problems. I'm mostly looking for a website that will have some suplemental problems to work and then some answers with good explanations. I don't suppose something like this exists?
 
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here is a good online book with problems: http://www.dartmouth.edu/~chance/teaching_aids/books_articles/probability_book/book.html
 

Thread 'Finding the nth roots of a complex number'

There are two things I don't understand about this problem. First, when finding the nth root of a number, there should in theory be n solutions. However, the formula produces n+1 roots. Here is how. The first root is simply ##\left(r\right)^{\left(\frac{1}{n}\right)}##. Then you multiply this first root by n additional expressions given by the formula, as you go through k=0,1,...n-1. So you end up with n+1 roots, which cannot be correct. Let me illustrate what I mean. For this...
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