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  4. A 6 alphabet word is formed from the set of vowels a, e, i, o, u such that each alphabet which appears in the word, appears atleast twice, then number of words that can be formed is

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Q. A 6 alphabet word is formed from the set of vowels $\{a, e, i, o, u\}$ such that each alphabet which appears in the word, appears atleast twice, then number of words that can be formed is

Permutations and Combinations

Solution:

Correct answer is (a) 1405

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