MS Excel
A circular reference is

Geometric modeling tool
A formula that either directly or indirectly depends on itself
A cell that points to a drawing object
Always erroneous

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MS Excel
You can select a single range of cells by

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

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