Why we calculate two numbers, not one, for dice rolls

Look at this. You should see the reason plainly. Graphic: Two dice

When you get a random number from 2 to 12 for a dice roll, you’re making the chances for a roll of 7 the same as 1 in 11.

That’s not how it is when you actually roll two dice. Because so many combinations can add up to 7, the probability is much higher — 17 percent.

Meanwhile, it’s really hard to roll “snake eyes,” or 2 (double ones). It’s equally hard to roll a 12, or two sixes. The chances for 2 or 12 are only 3 percent.

But only if you get two unique random numbers, one for each die.