Question

A group of 60 students is randomly split into 3 classes of equal size. all partitions are equally likely. jack and jill are two students belonging to that group. what is the probability that jack and jill will end up in the same class.

Answer 1

total students in each class =60/3 =20
p(j&j)=2/20=1/10
probability =1/10

Answer 2

Answer:

19/59

Step-by-step explanation:

to choose jack in a class of 20. number of ways 20.

to choose jill for same class number of ways 19.

so favorable ways = 19

Total sample space = 60-1 = jack is already chosen for a class and confirmed.

so Total sample space = 59

Prob = 19/59