moneybird 3 years ago 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?

1. TuringTest

is it 5! ?

2. moneybird

Im not really sure. There are five choices: a. 200 b. 120 c. 140 d. 240 and e 160

3. TuringTest

no wait that was wrong

4. moneybird

I think there are some tricks behind it. since it says no two friends trade books with each other

5. TuringTest

yes I thought it was perhaps deceptively simple, but no...

6. sunsetlove

240

7. TuringTest

can't each person hand their book to one of four people? or am I oversimplifying again?

8. TuringTest

oh that's not even a choice though

9. sunsetlove

none of them are divisible by 6 but 240, (There are five choices: a. 200 b. 120 c. 140 d. 240 and e 160)

10. sunsetlove

so D

11. TuringTest

6*20=120

12. sunsetlove

yes

13. sunsetlove

do u guys agree with my answer??

14. moneybird

oh, okay. thanks

15. sunsetlove

sorry i dont know exactly if its right of how to fined it

16. Mathbreaker