How do you get the sum of two columns multipied together?

I can't seem to figure out how to get the sum of two columns multiplied together without having to manually type out each location (example: A1*B1+A2*B2+A3*B3, etc..). Though the idea seems to be rather simple, everything I have tried has only given me an error. I know there must be an easier way of doing this, but I get lost in the explanations given in 'help' area of numbers, can someone help me?

C3=SUMPRODUCT(A3:A18, B3:B18)
the function SUMPRODUCT() takes ranges and multiplies corresponding cells in the ranges, then adds them together.
I the case I show SUMPRODUCT() performs:
A3*B3 + A4*B4 + A5*B5 + A6*B6 + ... + A18*B18
If you want to perform the same operation on the whole column (s) you could modify the formula:
C3=SUMPRODUCT(A, B)

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