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4 -letter words are formed using the letters A, B, C, D, E, F, G. Find the number of possible words are possible for each

4 -letter "words" are formed using the letters A, B, C, D, E, F, G. Find the number of possible words are possible for each of the following conditions.

  1. How many words can be created using above letters without condition?
  2. How many words can be created if no letter is repeated?
  3. How many words can be created starting with the letter A?
  4. How many words can be created with the second letter of each containing a vowel?

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