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I'll go first:

Problem:

A sample of N atoms of helium gas is confined in a 1.0 cubic meter volume. The probability that none of the helium atoms is in a $1\times 10^{-6}$ cubic meter volume of the container is:

(a) 0

(b) (10^{-6})^N

(c) (1-10^{-6})^N

(d) 1-(10^{-6})^N

(e) 1

Solution:

(c)