Question

Please Solve correctly ASAP.

A class consist of 55 students,

20 are juniors, 5 are seniors, and 15 are sophomore freshman

If the class is to be divided into groups of 5,10,15,7,2,1 and 15 (order does not matter in the group)

What is the probability of you being with your one friend in any of the group?

Answer 1

It is given that the there are total 55 students out of which 20 are juniors, 5 are seniors, and 15 are sophomore freshman.

Class is to divide into 7 different groups of 5,10,15,7,2,1 and 15. You can see that there is a total of 6 groups of size greater than or equal to 2 (5,10,15,7,2 and 15) and there is only a single group of 1.

We have to find the probability of you being with your one friend in any of the group.

N(S) = 7. since there is a total of 7 possible groups.

N(E) = 6. since you can join 6 groups with your one friend.

Thus, the probability of you being with your one friend in any of the group=6/7=0.857~0.86