MS Excel
A circular reference is

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

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MS Excel
Which of the following is invalid statement?

The width of a row and be specified manually or fit automatically
You can set the column width automatically fit the amount of text
Some picture can be applied as a background of a sheet
Sheet tabs can be colored

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MS Excel
Text formulas:

Concatenate and manipulate text
Return ASCII values of characters
Replace cell references
Show formula error value

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