The correct answer is the last one
The science books can be placed before or after the English books, so that’s two ways science-English or English-science.
There are 24 ways to arrange the 4 science books and 2 ways to arrange the English books.
So we have 24×2+2×24=96.
Antipodal mean on the opposite side of a sphere, and is therefore the furthest possible distance
384/.75=512. There are 512 pages in the book.