how to insert a radical sign using keyboard?

I am doing my match assignments and solving problem related to cube root or square root. But the problem I am facing is that I do not find a key on my keyboard that help me to insert a radical sign which is used to represent the root of a number. So I want to ask you is that possible to enter a radical sign with help of a regular keyboard? Any shortcut for that?
Nov 10 2011
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