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An advertising executive must select 3 different photographs for an advertising flier. If she has 10 different photographs that can be used, a. how many

An advertising executive must select 3 different photographs for an advertising flier. If she has 10 different photographs that can be used, a. how many ways can she select 3 of them? b. Four letters are to be selected from the letters in the word RIGIDITY. How many different combinations are there?

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