In an exercice I have to calculate the excess of a, b, c.

I found e(a) = 0, e(b) = 2, e(c) = 4 but seems false referring to a correction.
What am I doing wrong ?
Thank's
In an exercice I have to calculate the excess of a, b, c.

I found e(a) = 0, e(b) = 2, e(c) = 4 but seems false referring to a correction.
What am I doing wrong ?
Thank's
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