I am trying to write a formula to count the number of customers that are in a given year and for a specific collector. The account numbers are in column "A", the Date is in column "B", and the collector id is in column "C". I need a count of customer numbers for collector 1 that are in years 2015 and 2016. Any ideas?
Customer # Date Collector
1234 2015 1
5678 2016 1
9234 2015 4
7165 2017 7
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