Given the set a = {X / 3 less than or equal to x greater than 7}, B = {X / 2 less than x less than 10}, C = {X / 2x less than a} if B is a subset of C, find the value range of a?

Given the set a = {X / 3 less than or equal to x greater than 7}, B = {X / 2 less than x less than 10}, C = {X / 2x less than a} if B is a subset of C, find the value range of a?

If your b = B, then set a is the interference term. A is greater than or equal to 20

Let u = {x | x = 2K, K ∈ Z} and a = {x = 4K, K ∈ Z}, find CUA

Since u = {x | x = 2K, K ∈ Z} = {x | x = 4K, K ∈ Z} {x | x = 4K + 2, K ∈ Z},
So CUA = {x | x = 4K + 2, K ∈ Z}

If u = Z, a = {x | x = 2K, K ∈ Z}, B = {x | x = 2K + 1, K ∈ Z}, then ∁ UA=______ ，∁UB=______ ．

In the range of integers, except even numbers, they are odd numbers, so CUA = B, Cub = a