A three-lettered word is to be formed from the letters of the English alphabet. If the first and the last letter of the word are different vowels and the middle letter is a consonant, then in how many ways can the word be formed?
ATQ, There are 21 consonants and 5 vowels in the English alphabet. Number of ways to choose the first letter (vowel) 5C1 = 5 Number of ways to choose the second letter (consonant) = 21C1 = 21 Number of ways to choose the third letter (different vowel) = 4C1 = 4 (Since it must be different from the first vowel) Hence total number of ways = 5 × 21 × 4 = 420 ways
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