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I need to count number of columns in group


I need to count number of columns in group

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hello,

I need to count number of columns in group -

I have a matrix with SUM in the date area.

I have a group column (lats say 'city') and under it my columns (lats say 'street name');

Under each 'street name' I have cell with SUM function.

The problem is:

When The main group (city) is not expand I get the sum of all cities and what I want to get is an average.

So what I thought of was to divide that number in the number of streets under each city group.

How can I get that number?

Thanks.
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