excel - How to SUM the number of duplicates in a range by given value? -


a simple example below:

column list containing data column b list of unique data in column without duplicates column c number of duplicates each item in column b column

how write easy formula cells in column c sum each item in column b column a?

i used =sum(lookup($a$1:$a$10=$b$1)) c1 received: too few arguments function.

enter image description here

a simple countif() should suffice unless i'm misunderstanding..

=countif($a$1:$a$10,b1)

count if returns number of times second argument found in first argument (which range.)

example


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