Adjustment in levelling for same point vs unknown point

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Homework Statement


in photo 391 , we can see that the levelling work is back to the same point , which is TBM1 . so , the adjustment of correction is (Bs -Fs ) / number of points ... But in 392-394 , the levelling work is from a known point to a different point ...
I'm wondering that is the adjustment correct ? It's given that adjustment = end closure / number of TP ...

Homework Equations

The Attempt at a Solution


In the table provided , we can see that there are only 2 TP , why the author divided by 3 for the case in 392-394 ? [/B]
 

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are 392-394 wrong ? because the correction are not applied to first 3 reading ...