There are 30 different versions of an online homework. These are assigned randomly to the students. If a group of 4 classmates decide to work on the homework together, what is the probability that at least two of them receive the same version?
Hint: It is easier to calculate the probability of this event not happening

Question

There are 30 different versions of an online homework.  These are assigned randomly to the students.  If a group of 4 classmates decide to work on the homework together, what is the probability that at least two of them receive the same version?
Hint: It is easier to calculate the probability of this event not happening

anonymous · Answer

@campbell_st @Mertsj

anonymous · Answer

im thinking 1 - ( (#/#) * (#/#) )

anonymous · Answer

never mind i found how to do it