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2. (a). [3 marks] In how many ways can the symbols a,b,c,d,e,e,e.e,e be arranged so that no e is adjacent to another e? (b). [3
2. (a). [3 marks] In how many ways can the symbols a,b,c,d,e,e,e.e,e be arranged so that no e is adjacent to another e? (b). [3 marks] With n a positive integer, evaluate the following sum. (Hint: Binomial theorem)
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