=SUMPRODUCT(--($A$10:$A$15=A1),--($B$10:$B$15=B1),$C$10:$C$15)

The first part
$A$10:$A$15=A1
checks all the cells in the column, and when equal returns something
like
False, True, False, False, False
The -- preceding it converts this to
0,1,0,0,0
Same with the second column (B10:B15), The last column has actual
values. The sumproduct simply multiplies each element row-wise and then
adds up. So we have
0,1,0,0,0 * 0,1,0,0,0 * 11,12,13,14,15
=0,12,0,0,0
=12

You can select the cell which holds the formula and click on 'Evaluate
formula' to see how it works.

Mangesh

Mangesh


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