In how many ways can letters in a word CALCULUS be rearranged












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In how many ways can letters in a word CALCULUS be rearranged such that no 2 same letters stand next to each other. I’ve been thinking of Inclusion-Exclusion principle. Is there any different way to solve this task?










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  • 1




    $begingroup$
    Inclusion-Exclusion should work fine. You have three letters which appear twice, so you will not get that many terms in the final expansion for the rearrangements.
    $endgroup$
    – EuxhenH
    Jan 7 at 10:28










  • $begingroup$
    I know but I wonder if there’s any other way to do that not using sophisticated methods
    $endgroup$
    – Michael
    Jan 7 at 11:26










  • $begingroup$
    Not using sophisticated methods would force you to do tedious casework.
    $endgroup$
    – N. F. Taussig
    Jan 7 at 16:02










  • $begingroup$
    What would be the final answer then
    $endgroup$
    – Michael
    Jan 8 at 8:52










  • $begingroup$
    If you want additional feedback, then you should edit your post to show what you have attempted and explain where you are stuck. This tutorial explains how to typeset mathematics on this site.
    $endgroup$
    – N. F. Taussig
    Jan 8 at 10:56
















0












$begingroup$


In how many ways can letters in a word CALCULUS be rearranged such that no 2 same letters stand next to each other. I’ve been thinking of Inclusion-Exclusion principle. Is there any different way to solve this task?










share|cite|improve this question











$endgroup$








  • 1




    $begingroup$
    Inclusion-Exclusion should work fine. You have three letters which appear twice, so you will not get that many terms in the final expansion for the rearrangements.
    $endgroup$
    – EuxhenH
    Jan 7 at 10:28










  • $begingroup$
    I know but I wonder if there’s any other way to do that not using sophisticated methods
    $endgroup$
    – Michael
    Jan 7 at 11:26










  • $begingroup$
    Not using sophisticated methods would force you to do tedious casework.
    $endgroup$
    – N. F. Taussig
    Jan 7 at 16:02










  • $begingroup$
    What would be the final answer then
    $endgroup$
    – Michael
    Jan 8 at 8:52










  • $begingroup$
    If you want additional feedback, then you should edit your post to show what you have attempted and explain where you are stuck. This tutorial explains how to typeset mathematics on this site.
    $endgroup$
    – N. F. Taussig
    Jan 8 at 10:56














0












0








0





$begingroup$


In how many ways can letters in a word CALCULUS be rearranged such that no 2 same letters stand next to each other. I’ve been thinking of Inclusion-Exclusion principle. Is there any different way to solve this task?










share|cite|improve this question











$endgroup$




In how many ways can letters in a word CALCULUS be rearranged such that no 2 same letters stand next to each other. I’ve been thinking of Inclusion-Exclusion principle. Is there any different way to solve this task?







combinatorics inclusion-exclusion






share|cite|improve this question















share|cite|improve this question













share|cite|improve this question




share|cite|improve this question








edited Jan 7 at 10:30









N. F. Taussig

44.8k103358




44.8k103358










asked Jan 7 at 10:16









MichaelMichael

246




246








  • 1




    $begingroup$
    Inclusion-Exclusion should work fine. You have three letters which appear twice, so you will not get that many terms in the final expansion for the rearrangements.
    $endgroup$
    – EuxhenH
    Jan 7 at 10:28










  • $begingroup$
    I know but I wonder if there’s any other way to do that not using sophisticated methods
    $endgroup$
    – Michael
    Jan 7 at 11:26










  • $begingroup$
    Not using sophisticated methods would force you to do tedious casework.
    $endgroup$
    – N. F. Taussig
    Jan 7 at 16:02










  • $begingroup$
    What would be the final answer then
    $endgroup$
    – Michael
    Jan 8 at 8:52










  • $begingroup$
    If you want additional feedback, then you should edit your post to show what you have attempted and explain where you are stuck. This tutorial explains how to typeset mathematics on this site.
    $endgroup$
    – N. F. Taussig
    Jan 8 at 10:56














  • 1




    $begingroup$
    Inclusion-Exclusion should work fine. You have three letters which appear twice, so you will not get that many terms in the final expansion for the rearrangements.
    $endgroup$
    – EuxhenH
    Jan 7 at 10:28










  • $begingroup$
    I know but I wonder if there’s any other way to do that not using sophisticated methods
    $endgroup$
    – Michael
    Jan 7 at 11:26










  • $begingroup$
    Not using sophisticated methods would force you to do tedious casework.
    $endgroup$
    – N. F. Taussig
    Jan 7 at 16:02










  • $begingroup$
    What would be the final answer then
    $endgroup$
    – Michael
    Jan 8 at 8:52










  • $begingroup$
    If you want additional feedback, then you should edit your post to show what you have attempted and explain where you are stuck. This tutorial explains how to typeset mathematics on this site.
    $endgroup$
    – N. F. Taussig
    Jan 8 at 10:56








1




1




$begingroup$
Inclusion-Exclusion should work fine. You have three letters which appear twice, so you will not get that many terms in the final expansion for the rearrangements.
$endgroup$
– EuxhenH
Jan 7 at 10:28




$begingroup$
Inclusion-Exclusion should work fine. You have three letters which appear twice, so you will not get that many terms in the final expansion for the rearrangements.
$endgroup$
– EuxhenH
Jan 7 at 10:28












$begingroup$
I know but I wonder if there’s any other way to do that not using sophisticated methods
$endgroup$
– Michael
Jan 7 at 11:26




$begingroup$
I know but I wonder if there’s any other way to do that not using sophisticated methods
$endgroup$
– Michael
Jan 7 at 11:26












$begingroup$
Not using sophisticated methods would force you to do tedious casework.
$endgroup$
– N. F. Taussig
Jan 7 at 16:02




$begingroup$
Not using sophisticated methods would force you to do tedious casework.
$endgroup$
– N. F. Taussig
Jan 7 at 16:02












$begingroup$
What would be the final answer then
$endgroup$
– Michael
Jan 8 at 8:52




$begingroup$
What would be the final answer then
$endgroup$
– Michael
Jan 8 at 8:52












$begingroup$
If you want additional feedback, then you should edit your post to show what you have attempted and explain where you are stuck. This tutorial explains how to typeset mathematics on this site.
$endgroup$
– N. F. Taussig
Jan 8 at 10:56




$begingroup$
If you want additional feedback, then you should edit your post to show what you have attempted and explain where you are stuck. This tutorial explains how to typeset mathematics on this site.
$endgroup$
– N. F. Taussig
Jan 8 at 10:56










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