Question

Input 1, 2, 3, 4, 5, 6, 7, of 8 to describe the set by referring to the numbered regions.

W∩X′∩Y ′

Answer 1

X′∩Y ′ = {r1,r2}
W = {r2,r3,r5,r6}

W∩X′∩Y ′ is {r2} = {2}