=SUM(I47:I115) What does the "I" mean and how is it used?

D

David Biddulph

The I identifies the column. It is the 9th column from the left. The left
hand column is A, the 2nd column is B, and so on.

Your formula will give you the total of the numbers in the 47th to 115th
rows (inclusive) in the 9th column.
 
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