Answer the questions below. \( \begin{array}{l}\text { (a) To log on to a certain computer account, the user must type in a } 3 \text {-letter password. In such a } \\ \text { password, no letter may be repeated, and only the lower case of a letter may be used. How many } \\ \text { such 3-letter passwords are possible? (There are } 26 \text { letters in the alphabet.) } \\ \text { (b) } 50 \text { athletes are running a race. A gold medal is to be given to the winner, a silver medal is to be } \\ \text { given to the second-place finisher, and a bronze medal is to be given to the third-place finisher. } \\ \text { Assume that there are no ties. In how many possible ways can the } 3 \text { medals be distributed? } \\ \square\end{array} \)
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