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2 (two)

We find the number 2 so obvious that we sometimes omit it.

 

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Explanation

You write the square root of 3 as

and actually it is

You never write it this way, because everyone knows of course that it is the 2^nd root if there is nothing indicated. If you put it in more detail, it becomes

It is a form of exponentiation, because you can also write it as

and, of course, as

3^0.5

Sometimes this is more comfortable in a calculation.

 

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