NDA 2017 Mathematics question
The number of different words (eight-letter words) ending and beginning with a consonant which can be made out of the letters of the word 'EQUATION' is
Answer: (B)
Solution
EQUATION has 8 distinct letters: 5 vowels (E, U, A, I, O) and 3 consonants (Q, T, N). The first and last places can be
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