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Find the number of permutations of the l...

Find the number of permutations of the letters of the words 'DADDY DID A DEADY DEED'.

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Here, total letter 18, in which 9D's, 3A's, 2Y's, 3E's and rest occur only once.
`therefore`"Required number of permutations`=(18!)/(9!xx3!xx2!xx3!)`
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