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Probabilità composte


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Per risolverla basta metterla uguale ad x. 

Da cui si ricava x=√(1+x). Poste le C. E., cioè x≥o, eleviamo e troviamo x²-x-1=0 e la soluzione non è altro che (1+√5)/2, o ɸ, la sezione aurea.

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