MS Excel
To create a formula, you can use:

Values or cell references although not both at the same time
Value and cell references
Values but not cell references
Cell references but not values

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MS Excel
You can select a single range of cells by

Dragging over the desired cells
Pressing the Ctrl key while dragging over the desired cells
Pressing the Shift key and an arrow key
Clicking the upper-left cell in a group of cells and then pressing the Shift key while clicking the lower right cell in a group of cells

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