To copy cell contents, you can select the cell and then press the CTRL + C keys.
They act as a sort of a shortcut, so you don't have to select, right click and then choose copy.
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A programming and software development professional would most likely help with
Testing a software program.
The number system is what is use globally as are way of counting the total number of digits is 9 because you can make any number with characters 1-9
Input is the right answer.hope it helps.