An exciting Let a = {x | x = 2K, K belongs to Z (integer set)} Let a = {x | x = 2K, K belong to Z (integer set)}, B = {x | x = 2K + 1, K belong to Z}, C = {x | x = 2 (K + 1), K belong to Z}, d = {x | x = 2k-1, K belong to Z}, in a, B, C, D, which sets are equal, which sets are empty, which sets are union Z? Which friend is on the first floor?

An exciting Let a = {x | x = 2K, K belongs to Z (integer set)} Let a = {x | x = 2K, K belong to Z (integer set)}, B = {x | x = 2K + 1, K belong to Z}, C = {x | x = 2 (K + 1), K belong to Z}, d = {x | x = 2k-1, K belong to Z}, in a, B, C, D, which sets are equal, which sets are empty, which sets are union Z? Which friend is on the first floor?

A = C = {even}
B = D = {odd}
A. The intersection of B is an empty set. The intersection of a and D is an empty set
B. The intersection of C is an empty set. The intersection of C and D is an empty set
A. The union of B is z.a. the union of D is Z
B. The union of C is Z.c, and the union of D is Z