Substitution because you need to substitute one of the variables
<u>Answer:</u>
<h2>990</h2>
<u>Explanation:</u>
For first place, we have 11 choices
11 × __ × __
For second place, we have 10 choices
11 × 10 × __
And for third place, we have 9 choices
11 x 10 x 9 = 990 ways
This is also a permutation
11! / (11-3)! = 990
Hope it helps

because multiplying the two sides by 12 gives

which is true.
but examining other options will not result in a true expression.