if you’re good with set theory and this sudoko puzzle in math 30 please help with question 33

 A) 2, 7, 9

Step-by-step explanation:

In a sudoku puzzle, there are three rules:

Each vertical line must contain the numbers 1 - 9, with no duplicatesEach horizontal line must contain the numbers 1 - 9, with no duplicatesEach 3 x 3 box must contain the numbers 1 - 9, with no duplicates.

Using logic:

2 must go in the 1st box. It cannot go in the 2nd or 3rd shaded square because 2 is already in that 3 x 3 box.

That leaves the 2nd and 3rd shaded square.  

9 cannot go in the 2nd shaded square because 9 is already in that vertical line.

Therefore, 9 must go in the 3rd shaded square.

That leaves the 2nd shaded square.

7 must go in the 2nd shaded square because it is the only number remaining (2 and 9 have already been placed in the other squares).

There is no image, or it's not working.

With a continuous thought process.