In how many ways can the alphabets of the word ‘DERAIL’ be arranged so that the vowels come at the odd positions only?
Explanation: There are 3 consonants (D,R,L) and 3 vowels (E,A,I).
There are 3 odd positions and 3 even positions: O E O E O E.
Therefore, required number of arrangements = 3P3 * 3P3 = 6 * 6 = 36.
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