The number of words which can be formed ...

The number of words which can be formed out of the letters `a`, `b`, `c`, `d`, `e` `f` taken 3 together, each word containing one vowel at least is

A

128

B

24

C

72

D

96

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The correct Answer is:

D

Required number of ways
`""^(6)C_(3)xx3!-""^(4)C_(3)xx3!""=96`

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