countifs with drop down list

To make a drop down select the cell where you want to make drop down . then go to data menu and select data valuation and then select list
and choose the criteria which you want to make drop down
countifs formula :
=countifs( criteria range 1, criteria 1 , criteria range 2, criteria 2)
if you have any question you can ask me at
my Facebook page : / khan.labab.1