ধরি A = {x : |x − 1| < 1/10}, B = {x : All negative numbers} এবং C = {x : 0 ≤ x ≤ 1.1} তাহলে (A∪B)∪C সেট হলো-

ব্যাখ্যা

A = {x : |x − 1| < 1/10} = {−1/10 < x − 1 < 1/10} = {9/10 < x < 11/10}; B = {−∞ < x < 0}, C = {x : 0 ≤ x ≤ 1.1}; অতএব, A∪B = {−∞ ≤ x ≤ 11/10}, (A∪B)∪C = −∞ ≤ x ≤ 1.1