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From: Hadron Quark <hadronquark@gmail.com>
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Subject: Re: Elisp:  Simple function to Add Two Numbers
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Edward Dodge <user@foo.bar> writes:

> Please,
>
> Why do I get "wrong number of arguments" every time I try to run this simple,
> straight-forward code?
>
> (defun ekd-average (jabba wabba)
>   "Adds two numbers and returns the sum."
>   (interactive "nFirstvar: \nn Secondvar: \nr")
>      ( + jabba wabba))
>

As a fellow beginner I would say its because you havent properly
specified your second argument string in the interactive
statement. Check whitespace.