Permutations And Combinations

Question
CBSEENMA11014135

In how many ways can the letters of the word ‘PENTAGON’ be permuted, using all letters ?

(a) How many of them begin with P and end with N ?

(b) How many of them have the three vowels together ?

Solution

Solution not provided.
Ans.(a)  720 
      (b) 4320

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