excel formula - Duplicates and sorting -


my table updated see if picture of table helps understand trying do. thank you. b1 trying return column c count. have duplicates in column b (as mentioned previous table).

use array formulas count uniques:

=sum(if(b1:b8=0.5,1/countifs(a1:a8,a1:a8,b1:b8,0.5)))

being array formula must confirmed ctrl-shift-enter instead of enter when exiting edit mode. if done correctly excel put {} around formula.

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