Final answer:
To convert the formula =SUM(C1:$C$10) from A1 to R1C1 reference style, and place it in cell D1, it would be written as =SUM(R[-0]C[-1]:R10C3), where the references are adjusted to the position of D1.
Step-by-step explanation:
The Excel formula =SUM(C1:$C$10) in A1 reference style can be converted to R1C1 reference style. However, since the formula is to be placed in cell D1, it is important to note that R1C1 reference style uses the row and column numbers relative to the position of the formula. In R1C1, C1 would become R[-0]C[-1] because it's in the same row but one column to the left of D1. The absolute reference $C$10 would become R10C3 since it's an absolute reference to the third column and the tenth row. So, the adapted R1C1 reference style formula placed in cell D1 would be =SUM(R[-0]C[-1]:R10C3).