excel - Count duplicates and display order of occurence -


i attempting count number of occurrences of each value within column , output order in found (top bottom) unsorted data. have been unable find suitable formula accomplish task. assistance appreciated.

example:

number     duplicateindex 50               1 20               1 30               1 10               1 30               2 40               1 30               3 50               2

try,

=countif(a$2:a2, a2)

, in b2 , fill down.


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