Hi Pierre

One more option:

In K1:

=SUMPRODUCT(LOOKUP($C1:$I1,$A$1:$A$14,$B$1:$B$14))

Copy K1 down with the fill handle (the little square in the lower
right corner of the cell) if necessary.

--
Best Regards
Leo Heuser

Followup to newsgroup only please.

"Pierre Archambault" skrev i en meddelelse
...
Hi,

I need your help to solve a small formula problem.

A B C D E F G H I J K

1 0 1 3 4 5 9 11 12 = 3
2 0
3 0
4 1
5 1
6 0
7 0
8 1
9 0
10 1
11 0
12 1
13 0
14 0

I need to count in C1:I1 range, the number of times a given number appears
next to a "1" in the two

columns A1:B14

In this exemple, the answer is 3 because only the 4, 5 and 12 are
associated
with a "1" in the adjacent

column.

Thanks.

Pierre Archambault