Answer :

A = {x : x is a multiple of 5, x ≤ 30 and x ∈}

A contains the natural numbers that are less than or equal to 30 and multiples of 5.

∴ A = {5, 10, 15, 20, 25, 30}

B = {1, 3, 7, 10, 12, 15, 18, 25}

∴ A ∪ B = {1, 3, 5, 7, 10, 12, 15, 18, 20, 25, 30} [elements that are present in either A or B]

∴ A ∩ B = {10, 15, 25} [elements that are present in both A and B]

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