how many ways we can arrange A,B,C,D letters so that AB,BC,CD should not be together
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see this link
http://www.sitams.org/cource/material/cse_reasoning/4btech/IV%20Year%20-%20Permuations_Combinations....
http://www.sitams.org/cource/material/cse_reasoning/4btech/IV%20Year%20-%20Permuations_Combinations....
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