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anyone know statistics?

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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Perris Calderon wrote on Electronic Punk's profile.
Ep, glad to see you come back and tidy up...did want to ask a one day favor, I want to enhance my resume , was hoping you could make me administrator for a day, if so, take me right off since I won't be here to do anything, and don't know the slightest about the board, but it would be nice putting "served administrator osnn", if can do, THANKS

Been running around Quora lately, luv it there https://tinyurl.com/ycpxl
Electronic Punk wrote on Perris Calderon's profile.
All good still mate?
Hello, is there anybody in there? Just nod if you can hear me ...
What a long strange trip it's been. =)

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