simple stats problem

Hi, I've been trying to figure out this problem I got on an interview,
but I haven't been able to get a clear answer.

Suppose I have a room of N computers. Suppose each computer
fails at a rate of once every 14 days.

Now what is the probably that at least one of them fails?

I'm thinking it's 1 - prob(none of them fail). But then how do I
figure that out?

And if the question is what is the probably that at least one of them
fails, does that necessarily mean "out of those 14 days"? I didn't
have any other info than that.

Thanks for any help.
.