SOLUTION: There are 3 math books and 3 history books that are to be arranged on a shelf. How many different ways can the books be arranged on the shelf if 2 history books are to be kept toge

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Question 1163208: There are 3 math books and 3 history books that are to be arranged on a shelf. How many different ways can the books be arranged on the shelf if 2 history books are to be kept together and 2 mathematics books are also to be kept together? The two math books should be immediately followed by the 2 history books and vice versa.
Found 2 solutions by greenestamps, ikleyn:
Answer by greenestamps(13198)   (Show Source):
You can put this solution on YOUR website!

We have seen this question before, and the answer is the same: the problem is nonsense.

My guess is that whoever wrote the problem doesn't know what "vice versa" means.

"The two math books should be immediately followed by the 2 history books and vice versa."

That means 2 math books should be followed the 2 history books, and the 2 history books should be followed by 2 math books. That requires 4 math books (at least); but there are only 3.

Answer by ikleyn(52776)   (Show Source):
You can put this solution on YOUR website!
.

When you try to put more than one question per post in this forum,

    it always works AGAINST your own interests.

    it always works AGAINST your own interests.

    it always works AGAINST your own interests.

Never do it (!)