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Question

Number of 4 letter words starting with vowel that can be formed using letters of the word ′CHEMISTRY′ is

A
336
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B
504
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C
672
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D
1008
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Solution

The correct option is C 672
CHEMISTRY
The word can be started with either E or I.
If the word starts with E, then the rest 3 letters can be arranged in 8P3=336 ways.
Similarly, if the word starts with I, then the rest 3 letters can be arranged in 8P3=336 ways.
Total words =2×336=672

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