Question

Check If I am Correct ?


In how many ways 3 mathematics books, 4 history books, 3 chemistry
books and 2 biology books can be arranged on a shelf so that all books of the same
subjects are together.

Answer 1

I got



First we take books of a particular subject as one unit. Thus there are
4 units which can be arranged in 4! = 24 ways. Now in each of arrangements,
mathematics books can be arranged in 3! ways, history books in 4! ways,
chemistry books in 3! ways and biology books in 2! ways. Thus the total number
of ways = 4! × 3! × 4! × 3! × 2! = 41472.

Answer 2

@TessaMarie08181997
@mikaela19900630

Answer 3

yes that is correct