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Finding only triple occurances of duplicate items

  1. #1
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    Lightbulb Finding only triple occurances of duplicate items

    Hi, there's rows A and B as follows:

    A B
    1 9
    6 7
    21 30
    1 9
    9 1
    21 30
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    I am trying to display
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    C D
    1 9
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    as the resolution .

    By using the formula
    "=IFERROR(INDEX(A$1:A$5,SMALL(IF(FREQUENCY($A$1:$A$7*$B$1:$B$7/

    ($A$1:$A$7+$B$1:$B$7),

    $A$1:$A$7*$B$1:$B$7/($A$1:$A$7+$B$1:$B$7))>1,ROW($A$1:$A$7)-

    MIN(ROW($A$1:$A$7))+1),ROWS($1:1))),"") "

    the resolution is
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    C D
    1 9
    21 30
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    As there are duplicates in upper example however desired answer is supposed to be only 1 and 9 in Rows C and D excluding 21 and 30 because they have occurred only twice not thrice.

    Is there a way to achieve the desired resolution by editing or entering an entirely new formula or way?

    thanks

  2. #2
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    Re: Finding only triple occurances of duplicate items

    hmmm
    use the formula button so you dont paste a formula over 4 lines....

    not sure how your example came up to A7 when there are 6 lines of data

    Formula: copy to clipboard
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    adjust the range accordingly
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  3. #3
    Forum Expert azumi's Avatar
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    Re: Finding only triple occurances of duplicate items

    Perhaps you need helper column, and the array formula is

    put in D2 and entered as array and copied down

    =IFERROR(INDEX($F$2:$F$7,MATCH(0,COUNTIF(D1:$D$1,$F$2:$F$7)+IF(COUNTIF($F$2:$F$7,$F$2:$F$7)>1,0,1),0)),"")
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  4. #4
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    Re: Finding only triple occurances of duplicate items

    Thank for the answer, your awesome

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