A dictionary is to printed without usage of vowels and without repetition of alphabets in any word.

Then the number of words in that dictionary would be?

Please explain the method.

Dear Speed ,

 now we have 21 letters and the maximum number of letters in a word can be 21 as repititon is not allowed so

total number of single letter words   are P (21 ,1 )

total number of 2 letter words  are P (21 ,2 )

total number of 3 letters word are  P(21,3)

THIS WILL GO ON UPTO 21 LETTERWORDS THAT WILL BE P(21,21)

 and all we have to do is we have to add all of them we get total number of words in dictionary

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