GO :
In paging, Arjun Sir took whole page size as page table, i.e lets say for $P_1$ there are $195$ pages and $entry$ $ size=4B$ , so its total $780B$ $level1$ page table size , and additional $4B$ for $level2$ page table , so in total its $784B$.
But Arjun Sir considered $1KB$ for $L1$ and $1KB$ for $L2$ , so in total $2KB$ , which is far more than just $784B$ , and we never took
$Page$ $Table$ $Size$ in terms of $page$ $size$
so just kept on adding in terms of $Bytes$ .
P.S :
In this comment,
In $P_3$ calculation, for paging he considered $1KB$ for level 1 page table ,
and for paging + segmentation he considered
$0.25KB$ for level 1 page table , why ?
(I do understood rest but sir please give your intuition for just single process in terms of paging, segmentation and segment + paging )