Try this:

=SUMPRODUCT((A1:A6=1)*(B1:B6=1))

--
HTH,

RD

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"Dr. saeed mohtasham nia" <Dr. saeed mohtasham
wrote in message
...
Dear friends: I have two set of data only 1 & 0. and want to use countif
function
to choose those cells with only 1.
my data is he
1 0
0 1
1 1
0 1
1 0
1 1

I want to count the cells containing only 1 1
please helpme. thanks.