excel - Find the maximum value associated with a specific value in a different column -

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i need find largest value in column b associated specific value in column a. here's example of mean:

      b  2       1 2      14 2      22 5       6 5       8 5      99

i.e. want find the largest value, 22, in column b on same row 2 in column a.

i'm using try find value, finds first value:

 =vlookup(a2, a1:b20, 2, false)

please try: 

=max(if(a:a=2,b:b))

entered ctrl+shift+enter.


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