A = {12,13,14,15,16}

B = {11, 15,17,18}

C = {18, 19, 20, 21, 12}

with venn diagram please

(A U B) ∩ C = {18}

(A ∩ B) ∩ C = {}

(A ∩ C) ∩ B = {}

(A U C) – B

(A – C) ∩ B`

B = {11, 15,17,18}

C = {18, 19, 20, 21, 12}

with venn diagram please

A = {12,13,14,15,16}

B = {11, 15,17,18}

C = {18, 19, 20, 21, 12}

with venn diagram please

(A U B) ∩ C = {18}

(A ∩ B) ∩ C = {}

(A ∩ C) ∩ B = {}

(A U C) – B

(A – C) ∩ B`

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Answer:you are in 9th standard according to me I will surely solve and send you today