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Question

Different words being formed by arranging the letters of the word "INTERMEDIATE". All the words obtained are written in the form of a dictionary,
The number of arrangements in which vowels & consonants occur alternatively are

A
43300
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B
43200
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C
21600
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D
None of these
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Solution

The correct option is B 43200
There are 6 vowels and 6 consonants.

Thus, to occur alternately, the series may start with a consonant OR a vowel i.e. there are 2 cases.

The vowels may be arranged in 6!2!3! ways (since we have I 2 times and E 3 times)

The consonants many be arranged in 6!2! ways (since we have T 2 times)

Thus, total arrangements =6!6!2!3!2!×2=43200
Hence, (B) is correct.

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