Question 23
Peter has five different books, one for each of five subjects, to arrange in a row on a single shelf. The Physics book must not be next to the Biology book. In how many ways can he arrange all five?
Answer format: enter one whole number without units. The printed paper uses four answer-sheet digits with leading zeros when needed; ordinary numeric entry is used here.
Answer format: enter one whole number without units. The printed paper uses four answer-sheet digits with leading zeros when needed; ordinary numeric entry is used here.