In how many ways given letters can be arranged
i) In how many ways can letters a,b,c,d,e,f be arranged so that letters a and b are not next to each other?
ii) In how many ways can letters a,b,c,d,e,f be arranged so that letters a and b are next to each other, but a and c are not?
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In how many ways can letters a,b,c,d,e,f be arranged so that letters a and b are next to each other, but a and c are not?
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