Risk Reduction equation

ghinson

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Joined
Aug 4, 2015
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If, after a point in time, your risk of an event falls by 50% in 1 year and then by 100% in 15 years, can someone help me with the equation that will look at your risk reduction to date for any given day following the original point in time?

(Forgive me if this is not the right forum. The real life scenario I am trying to solve for is financial, though the equation may or may not be, I guess.)

THANK YOU.
 
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