Simplify the expression.
negative the quantity 1 divided by 2 end of quantity plus 1 divided by 6.
a. 1 divided by 3.
b. negative the quantity 2 divided by 3 end of quantity.
c. 2 divided by 3.
d. negative the quantity 1 divided by 3 end of quantity.

    1           1           3+1             4             2
- + = - = - = -
    2           6               6               6             3

so choice b. is right sure 

The first one, i believe, would be correct. all the others have one thing in common, and that's that they have repeating numbers. in the second one, x and y have repeating 6's and 3's, and in the third, x and y have repeating 6's as well. in the last one, there are repeating 3's. the first one has no repeating numbers.