1 .
Consider 10 boxes and 10 balls. We throw each ball, uniformly, in a random box. What is the
probability that, after we have thrown all 10 balls, none of the 10 boxes is empty?
(a)
$1 - \frac{10 \cdot (9/10)^{10}}{10^{10}}$
(b)
None of the above.
(c)
$\frac{10^{10}}{10!}$
(d)
$\frac{10!}{10^{10}}$