Ive always wondered about this: Lets say there is a chance of 1 in 23.000 to get a certain disease. But we know that there Are a lot more diseases with those odds Aprox of apearing, would that make the ods lets say 1 in 2.300 of geting a rare disease? Or is it 1 per 23.000 healthy person.
Sorry for bad grammar.
In: Mathematics
Not sure the exact question you’re asking, but generally speaking when you look at probability (like 1 in 10000), if they are completely independent from each other you add them to figure out the chance of either of them happening, and multiply them to figure out the chance of both of them happening.
So if you have two rare diseases, one is 1 in 23,000 and the other is 1 in 25,000.
So the average chance either of them affects you (as in you get one of the two diseases) is 48 in 575000, reducing to 6 in 71875 (which is *roughly* 1 in 11,979).
The average change both of them affects you is 1 in 575,000,000 (25000 * 23000).
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