In how many ways the letters of the word 'DESIGN' can be arranged so that no consonant appears at either of the two ends?

240
72
48
36

Correct Answer: 48

Explanation:

DESIGN = 6 letters

No consonants appear at either of the two ends.

= $2 x 4 P 4$ = 2 x 4 x 3 x 2 x 1= 48

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