tirsdag den 4. februar 2020 kl. 12.05.46 UTC+1 skrev Vuko Strugar:
If last cell is AY1, i.e., last pair to multiply is AX1*AY1, as you wrote in your example, then try this formula:

=SUMPRODUCT(A1:AX1,B1:AY1,--(MOD(COLUMN(B1:AY1)-COLUMN(A1),2)=1))

For different range, adjust AX and AY accordingly.


On Monday, 3 February 2020 13:09:56 UTC+1, Daddy Sage wrote:
In a spreadsheet I have numbers in the first row of each column from A to ?

The numbers has to be multiplied like this A1*B1, C1*D1, E1*F1 and so on. Finally the results have to be added.

Is possible in a single formula without entering all the single multiplications in a SUM(); something like =Sum(A1*B1:AX1*AY1)?

Jan

Sorry! it took me so long to get back, but it works. Thank you.

Jan