Explain the difference between o and oz and between ju and u The quantity u is the -Select- quantity o is the --Select-- v, while the quantity u, is the --Select-- while the quantityoz is the -Select-- | of all possible ---Select-- of all the possible -Select-- The

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4 -letter words'' are formed using the letters A, B, C, D, E, F, G. How many such words are possible for each of the following conditions?

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