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4%20%60frac%7B%2015%20%20%7D%7B%2032%20%20%7D%20
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sum of all coprimes of a number.
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The solution for this would be Risk Neutral Probability = \frac{(1-d-(1+r)k)}{u-d-(1+r)k} Fair Price of the Option = \frac{1}{1+r}\left(p\psi{(u)}+(1-p)\psi{(d)}\right) where \psi{(u)} = Max((110-100),0) = 10 ...
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