okay... can I ask what improvement you think we can make? Maybe adding another 6 points?

Anywat, I believe there are actually more than 6 possibilities, we have [-6. 6] so that's 13 integers.... choosing 2 numbers from 13 means C(13,2) = 26 possibilities... Saying there are only 6 possibilities is assuming the student understand the question put two dots opposite of each other (i.e. put one at 1 and another at -1), but that's not the case. If they did put two dots opposite of each other, that means they understand the question (the geometric meaning of absolute value) so it's not so bad that they have 1/6 chances of getting right, in comparison of blindly 1/26 possibility of doing right.