Answer: 33, 42, and 51
Explanation: In this problem, we're given the pattern -3, 6, 15, 24 and so on and we're asked to find the next three numbers in the pattern.
So studying the numbers we're given, notice that each number is 9 more than the number before it.
In other words, -3 + 9 is 6, 6 + 9 is 15, and 15 + 9 is 24.
So if we continue with the same pattern to find the next three numbers,
24 + 9 is 33, 33 + 9 is 42, and 42 + 9 is 51.
So the next three numbers in the pattern are 33, 42, and 51.