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@satellite73 can u help me out.

1/4

So the probability that second guy gets it is 1/3

ash, the answer's 1/3

idk how they got it though. Exactly one student gets the phone back.

100 % probability if they are in senses. lol
but it ll be 1/24

oh sorry, lemme think..

can someone please help me? x :)

yeah, it is coming 1/3 :)

I'm thinking:
(1/4) "first student got" + (2nd|Nobody else got theirs)

and then 3rd got his given nobody else got theirs and then 4th got his, etc..

got it, @ bahrom7893?

what do u mean by deranged? this may be a dumb question, but I've never heard of the term before.

u know about derangement?

nope.

ok, derangement is a kind of arrangement where no right thing goes to right place..

Ohh ok. What is the formula for derangement?

http://en.wikipedia.org/wiki/Derangement

there is a general method:
Dr= r!(1/2!-1/3!+1/4!-..... upto 1/n!)

sorry, last term is 1/r! ^^

kk ty everyone!

welcome :)