Question: How many different five-letter strings can be formed from the letters A, B, C, D, E (repeats allowed) if the first letter must be a

  1. How many different five-letter strings can be formed from the letters A, B, C, D, E (repeats allowed) if the first letter must be a vowel and the last letter must be a consonant?
  2. The following problem refers to strings in A, B, ..., Z. How many four-letter strings are there that begin with W?

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