Answer :

X = {x : x = 2n, x ≤ 20 and n ∈}

X is twice of a natural number(n ∈ N) and less than or equal to 20.

∴ X = {2, 4, 6, 8, 10, 12, 14, 16, 18, 20}

Y = {x : x = 4n, x ≤ 20 and n ∈ }

Y is 4 times a positive whole number(n ∈ W) and less than equal to 20.

∴ Y = {0, 4, 8, 12, 16, 20}

∴ X ∪ Y = {0, 2, 4, 6, 8, 10, 12, 14, 16, 18, 20} [elements that are present in either X or Y]

∴ X ∩ Y = {4, 8, 12, 16, 20} [elements that are present in both X and Y]

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