How many words can be made using letters of word "ADVISE"whenever 2 vowel should not come together????

• 4P3 * 3! = 4!*3!=144
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• total possible words = 4*3!*3!=144
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• No of arrangements by taking vowels together=5!*2!=240
  No of arrangements by taking all letters=6P6==6!=720
  Required words=720-240
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• there are 3 vowels
  so,4P4*3!=144
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