The question posed is: "Suppose you flip a coinntimes. If you win a dollar every time the coin comes up heads and lose a dollar every time it comes up tails, what is the probability that you will winkdollars?"

The answer given is: "If 2 doesn't divide $\displaystyle n + k$, the probability is 0. If 2 does divide $\displaystyle n + k$, the probability is $\displaystyle {n \choose \frac {n + k}{2} }$"

Does this make sense to anyone?