MS Excel
To create a formula, you can use:

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

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MS Excel
You can select a single range of cells by

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

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