Need help with the following:

Column N contains numeric values (page counts) - I need to add the sum of N
under 2 conditions. N will always contain a numeric value

1) Total of N for all records where A= Y and B= Y
2) Total of N for all records where A= Y and B= N
3) if either of the above conditions are not met, the value in N is not
included

These 2 totals will reside in two diff cells - doesn't matter where, say M1
and M2 respectively.

Thanks in advance for the help