I need a simple formula to count the total number of repeated text in a list
(column). Say there is thousands of entries (confirmation numbers) both
numeric, alphabetic and alpha-numeric but many of the entries are repeats.
How can I calculate in one cell the total number of repeated instances in the
list? And I can't sort the list, just calculate the number of repeated
instances in the list just the way it is, and the list is still growing, so I
need the formula to be able to count all instances in the list even as they
are being added. plz help !