Question: 5. Let S be a set {1, 2, 3, ..., k} where k is equal to the length of your surname. So for Steven (whose

5. Let S be a set {1, 2, 3, ..., k} where k is
5. Let S be a set {1, 2, 3, ..., k} where k is equal to the length of your surname. So for Steven (whose surname is Kelk), S = {1, 2,3, 4}. How many functions are there from S to S that are not bijective? This requires a bit of thought

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