Conditional formatting column problem

In my spreadsheet I have an array formula that idenitifies the last column used. This appears to be working ok.
I now would like to use conditional formatting to highlight that last used column.
Here's what is not working:

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$B$12 tells me what column in the array A1:X10 was last used. The value returned was a 4 which is column 4 and that is correct. My conditional formatting range is from $A$1:$X$10. However, I cannot get column 4 shaded

I've even changed the conditional formatting rule to this with no luck:

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Frank FreeseAsked:
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The first one should work.  Make sure the Applies To range in your CF condition equals: =$A$2:$X$10
Frank FreeseAuthor Commented:
That failed also. Here's the workbook
Frank FreeseAuthor Commented:
I found the problem - stupid me.
Please share your finding for points
barry houdiniCommented:
It's $C$12 not $B$12 isn't it?

regards, barry

PS you could get the same cells formatted without using the formula in C12. Use the same "applies to" range with this CF formula


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Frank FreeseAuthor Commented:
And the winner is - - Barry. Good catch. Just another senior moment for me.
Thank you
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