Hint:
Remember that the symmetrical factor, page 1 is linked to that of page 28, page 3 is connected with page 26, page 5 is connected with 24 and so on until the mid page comes which are 13, 14, 15, and 16.
Complete step-by-step answer:
Given: we have given that the total number of pages in newspaper are 28, 4 number of pages are missing and one of the page numbers which is missing is page number 10.
Since page 10 is missing,
The page which is on the other side of the same paper is also missing.
So, the page which is missing on the other side is that of page 9.
Now, look into the other side.
Consider the symmetrical factor that page 1 is linked to that of page 28.
So, if the 1st page is missing then the last page missed automatically.
So, page 1,2 connects to 28, 27.
Page 3, 4 connect to 26, 25.
Page 5, 6 connect to 24, 23.
Page 7, 8 connect to 22, 21.
Page 9, 10 connect to 20, 19.
So, our missing page is 19, 20.
There is more probability for those pages to get missed while compared to other pages.
Therefore, the missing pages are 9, 10, 19, 20 respectively.
Note:
In this problem we took page 9 on the other side of page 10 because the newspaper starts with page 1 and its other side is page 2 and they are connected with the last page as page 1 and 2 are connected with page 28 and 27.
