Determine if solving the problem needs permutation or combination. Then, show the working equation. 1. In how many ways can you invite one or more of your five friends in a party? 2. A certain company will hire 7 men and 4 women. In how many ways can the company choose from 9 men and 6 women who qualified for the position? 3. In how many ways can you form a four-letter word that can have repeating consonant but not vowel?

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