# This is Mean!

Discrete Mathematics Level pending

Let $$n>1$$ be a positive integer.

Consider "$$n$$" numbers such that their mean is "$$M$$".

If one of the "$$n$$" numbers, let's say "$$a$$", is gone, the mean is now "$$N$$".

Calculate "$$M-N$$" in terms of "$$M$$", "$$n$$" and "$$a$$".

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