MS Excel
To create a formula, you can use:

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

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MS Excel
You can select a single range of cells by

Pressing the Ctrl key while dragging over the desired cells
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
Dragging over the desired cells
Pressing the Shift key and an arrow key

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