{"status": "success", "data": {"description_md": "Six friends will exchange books in their book club. Each friend has one book to give to a friend, and will receive one book from a different friend. (No two friends trade books with each other.) In how many ways can the books be exchanged?\n\n$\\text{(A)}\\ 200\\qquad\\text{(B)}\\ 120\\qquad\\text{(C)}\\ 140\\qquad\\text{(D)}\\ 240\\qquad\\text{(E)}\\ 160$\n\n___\n\n**[Cayley](https://www.cemc.uwaterloo.ca/contests/past_contests.html#pcf), by [CEMC](https://cemc.uwaterloo.ca/), is licensed under the [CC BY-NC 3.0 DEED](https://creativecommons.org/licenses/by-nc/3.0/). They are not affiliated with or endorse TopsOJ in any way.**\n", "description_html": "<p>Six friends will exchange books in their book club. Each friend has one book to give to a friend, and will receive one book from a different friend. (No two friends trade books with each other.) In how many ways can the books be exchanged?</p>\n<p><span class=\"katex--inline\">\\text{(A)}\\ 200\\qquad\\text{(B)}\\ 120\\qquad\\text{(C)}\\ 140\\qquad\\text{(D)}\\ 240\\qquad\\text{(E)}\\ 160</span></p>\n<hr>\n<p><strong><a href=\"https://www.cemc.uwaterloo.ca/contests/past_contests.html#pcf\">Cayley</a>, by <a href=\"https://cemc.uwaterloo.ca/\">CEMC</a>, is licensed under the <a href=\"https://creativecommons.org/licenses/by-nc/3.0/\">CC BY-NC 3.0 DEED</a>. They are not affiliated with or endorse TopsOJ in any way.</strong></p>\n", "hints_md": "", "hints_html": "", "editorial_md": "", "editorial_html": "", "flag_hint": "", "point_value": 3, "problem_name": "2012 Cayley Problem 24", "can_next": true, "can_prev": true, "nxt": "/problem/12_cayley_p25", "prev": "/problem/12_cayley_p23"}}