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In how many ways can the letters of the word PERMUTATION be arranged
i...
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 Pawan Kumar  Offline | Posted on : 12:36:20 PM on February 08, 2012 In how many ways can the letters of the word PERMUTATION be arranged
if there are always 4 letters between P and S? |
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basil Offline | Posted on : 02:23:42 PM on February 08, 2012 but where s S here? suppose bw P and N, then make them fixed first, arrange other letters, now u can move P-N pair from one end to other and finally *2 as u can interchange P and N. |
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