How many 'words' with four letters are there that start with a vowel and end with the letter ‘D’?
3380
87880
3250
78000
There are five ways available since the first letter must be a vowel.
There are 26 possible ways for the second letter.
There are 26 possible ways for the third letter.
There is only one way because the last letter has to be a ‘D’.
Therefore, the number of words formed with four letters is
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