Question: 3.2.1 A certain set contains n distinct elements. Find n if the number of: (i) All possible permutations of length 2 equals 90. (ii) Permutations

3.2.1 A certain set contains n distinct elements. Find n if the number of: (i) All possible permutations of length 2 equals 90. (ii) Permutations of length 3 is 10 times larger than the number of permutations of length 2.

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