Hi everyone,

I am reading this fomular and cannot understand it.

=SUMPRODUCT($Q$13:$Q$309,($P$13:$P$309=$D20)*1,($O$13:$O$309=H$8)*1)

Basically each input should be a matrix and the first one really is. However the other two are not and look unfamiliar to me.

Could you please explain it to me? Thank you very much