There are 132 ways of selecting them.
What is permutation and combination ?
permutations and combinations, the various ways in which objects from a set may be selected, generally without replacement, to form subsets. This selection of subsets is called a permutation when the order of selection is a factor, a combination when order is not a factor.
According to the question,
So if there are 12 trumpet players, then teacher may take the leader, then, after he's taken, there are 11 ways of picking co-leader.
Multiply both numbers of possibilities
= 12× 11
=132
Hence ,There are 132 ways of selecting them.
To learn more about permutation and combination from here
https://brainly.com/question/13387529
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