Answer :
The preferred method is using the keyboard/mouse to insert functions into formula
How to determine the preferred method?
The scenarios are given as:
- Insert functions using the keyboard/mouse
- Insert functions without using the keyboard/mouse
Using the keyboard and the mouse to insert functions would be faster and more efficient, compared to not using the keyboard and the mouse
Hence, the preferred method is using the keyboard/mouse
Read more about keyboard and mouse at:
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