What would be the best way to solve for n if(adsbygoogle = window.adsbygoogle || []).push({}); _{10}P_{n}= 90?

Also, how would you solve this problem:

In a student council election, there are 3 candidates for president, 3 for secretary, and 2 for treasurer. Each student may vote for at least one position. How many ways can a ballot be marked?

Thanks in advance.

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# Homework Help: Permutations & Combinations

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