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Question

In how many ways can the letters of the word 'ALGEBRA'be arranged without changing the relative order of the vowels and consonants ?

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Solution

There are 4 consonants in the word 'ALGEBRA'.
The consonants are L, G, B, R. they 4 letters.
So, the number of ways to arrange these consonants = 4!
There are 3 vowels in the given word of which 2 are A'S
The vowels can be arranged among themselves in 3!2! ways.
Hence, the required number of arrangements
=4!×3!2
= 4×3×2×3×22
= 72


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