Hi Guys

I am quite new to IF Statements, but I have been thrown into a deep end. I
want three different values in cells in a column. My problem is that I can
get true or false values but I can't leave the cell blank if there is no
data in cells A1 and B1. The function that I want is that if cells A1 and B1
have values then D1=Sum(A1:B1) and Cell C1 then dispalys either Y, P or N,
which I want and got it right. If there are no values in Cells A1 and B1
then I am getting Y or False in Cell C1 but I want it to be left blank. The
statement looks something like this:

=IF(D1=(A1+B1),"Y",IF(D1<1,"N",IF(D1<(A1+B1),"P") ))


Please Help!!!!