How many 4- letter words can be formed using the letters a, b, c, d, e and f, if a) the word must start with a vowel?(cannot be repeated) b) the word should start and end with a consonant?

How many 4- letter words can be formed using the letters a, b, c, d, e and f, if

a) the word must start with a vowel?(cannot be repeated)

b) the word should start and end with a consonant?

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How many 4- letter words can be formed using the letters a, b, c, d, e and f, if a) the word must start with a vowel?(cannot be repeated) b) the word should start and end with a…

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