I have blocks of data in a sheet, every time there is an entry in column A a
new range begins and (in terms of rows) goes as far as until there is another
entry in Column A.

All the entries in Column A are in A9 with "validation data list" i need to
retireve the last row of the range of the selected entry using built in
formulas.

I have this to get the first row and it works
=MATCH( A9,$A$41:$A$10000,0)+40

Need the one to find the last row of that range which is delimited by the
next entry in ColA
Thanks in advance