excel - Need to grab the highest and lowest number in adjacent cells -


in excel, attempting show 1-4 aaaa, 5-7 bbbb, etc

num words 1   aaaa 2   aaaa 3   aaaa 4   aaaa 5   bbbb 6   bbbb 7   bbbb 8   cccc 9   cccc 10  cccc 11  cccc 12  cccc 13  cccc 14  cccc 15  dddd 16  dddd 17  dddd 18  dddd 19  dddd 20  dddd

my logic in head @ whole column , grab highest number of set of adjacent cells match words. grabbing output described above each word.

thanks assistance.

example

i assume there header row. in c2 put:

 =if(min(if(b2 = b:b, a:a))=a2, a2 & "-" & max(if(b2 = b:b, a:a)),"")

it array formula , needs confirmed ctrl-shift-enter. copy down.

enter image description here

note:

if search range static change full column references absolute range, e.g. a:a in case become $a$2:$a$21. make formulas calculate quicker.


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