MS Excel
You can select a single range of cells by

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

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MS Excel
The auto calculate feature

A and C
Automatically creates formulas and adds them to a worksheet
Can only add values in a range of cells
Provides a quick way to view the result of an arithmetic operation on a range of cells

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