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7. Simplify the following expressions. (2 marks each) (n -3)! a. (n -2)! n!(n + 1)! b. (n -1)!(n-1) 7. Simplify the following expressions. a.

7. Simplify the following expressions. (2 marks each) (n -3)! a. (n -2)! n!(n + 1)! b. (n -1)!(n-1)

7. Simplify the following expressions. a. b. (2 marks each)

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