3 ms·
Well I actually came up with it on the spot. Just think of the venn diagram, and add the areas of A and B, which counts A^B twice, and then just remove it twice
by EGreg 3y ago
Well I actually came up with it on the spot. Just think of the venn diagram, and add the areas of A and B, which counts A^B twice, and then just remove it twice. :)