SUMPRODUCT and IF conditional (LibreOffice)

Question

I would like to multiply two cells in a same row, if a condition of a third adjacent cell is met; then sum the result to the next product in the next row (if condition is met), and so on.

   | A | B | C |
---|---|---|---|
 1 |   |   |   |
 2 |   |   |   |
 3 |   |   |   |
 4 |   |   |   |

Something like this:

Loop (from i = 1 to i = 4)
    if (Ci == "Some text")
        sum += (Ai * Bi)

I have tried with this formula, which doesn't work:

=SUMPRODUCT(A1:A4, B1:B4, IF(C1:C4="Some text", 1, 0))

And this, which gives me some incorrect sum. EDIT: It does work, I was blind.

=SUMPRODUCT(A1:A4, B1:B4, C1:C4="Some text")

What am I doing wrong, and how should I proceed?

---

EDIT: Now I see that the conditional =IF(test, then_value, otherwise_value) doesn't seam to accept a range for the test value.
So, how can this be archived?

EDIT 2: I was blind. Indeed, this works:

=SUMPRODUCT(A1:A4, B1:B4, C1:C4="Some text")

Answer 1

I was blind, this does indeed work:

=SUMPRODUCT(A1:A4, B1:B4, C1:C4="Some text")