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anyone know statistics?

#1
here is my question. I took statistics but i forgot how to do this.

if i use product A which will prevent me from getting a cold 60% of the time

andi have product B which will prevent me from getting a cold 70% of the time

what is the % that i will get sick if i use both
(this is just an example i conjured up)
what i want to know is: what the formula i need to figure this out.

Any help is appreciated.
 

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