Correct Answer: 7

Solution : Given:

Here, biology students represent the region are → 2, 4, 5, 7

And, Mathematics students represent the region are → 1, 4, 5, 6

Computer students represent the region are → 3, 5, 6, 7

Both biology and computer students represent the region are → 5 and 7

But, 5 also represents the mathematics region

So, the students who study biology and Computers, not Mathematics are only the region 7.

Hence , the second option is correct.