e set. Clearly, the first packet bought would contain a new card w n. The next card obtained might simply duplicate the first card, d, and add to the collection, and so on. Obtain expressions for the number of packets which must be purchased until a complete set

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A:

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Q: Let A = {1, 5, 9} and B = {1, 2, 4, 7}. Determine the set A × B

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A: