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The symbol that sits over this subscript "n" is used frequently in "actuarial notation". How should it be coded in LaTeX?

http://upload.wikimedia.org/wikipedia/commons/5/56/Actuarial_notation.svg

marked as duplicate by Mico, Masroor, Guido, Malipivo, Claudio Fiandrino Oct 4 '14 at 6:53

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