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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