I would like a formula that will count how many times a number appears in one column if a specific number or letter also appears in another column.
For example:
If Column A contains "A", "B", "C", "D" and Column D contains "11", "12", "13", "14". I want another cell to produce the sum of how many times "11" appears in Column D when the corresponding line in column A also has a "B".
Thanks
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