{=IF(A2:A12=1,COUNTIF(B2:C11,"Yes"),0)}

This should work

Atif

"Count-Adi" wrote:

I am trying to use COUNTIF function where the range might vary. For instance,
I want to know how many yes I have in column D and E together, with the
condition that C will be only equal with 1.

C D E
1
1 Yes
1 Yes
1
2 Yes
2
2 Yes
3 Yes
3 Yes
3 Yes
3

{=COUNTIF(IF($C$1:$C$11=1,$D$1:$E$11,0),"yes€�)} should be 2.

Thanks for your help.