Excel: Countifproblem


I have a column of data which includes numbers, some of these numbers may be repeated. I need to count how many times a number appears twice for all numbers. EG 1 1 1 2 3 2 4 The answer would be 2 AS the number 1 appears more than once and the number 2 appears more than once. Therefor the answer will be 2. Could anyone help me with a formula please?


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