Answer:
22,084,920 different clubs can be formed from the group
Explanation:
The order in which the students are chosen to the club is not important. So we use the combinations formula to solve this question.
Combinations formula:
is the number of different combinations of x objects from a set of n elements, given by the following formula.

In this question:
6 juniors, from a set of 13.
8 seniors, from a set of 16.
So

22,084,920 different clubs can be formed from the group