Letters of the word SUDESH can be arranged in
(a) 120 ways when two vowels are together
(b) 180 ways when vowels occur in alphabetical order
(c) 240 ways when vowels and consonants occupy their respective place
(d) 240 ways when vowels when vowels do not occur together.

Total ways =6!/2!=360 If vowels occur together then 5!2!/2!=120 ways
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