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which of the following is not a valid set? (a) {10, 11, 20, 21} (b) {12, 14, 16, 8} (c) {11, 22, 33, 11} (d) {5, 10, 15, 20}
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which of the following is not a valid set? (a) {10, 11, 20, 21} (b) {12, 14, 16, 8} (c) {11, 22, 33, 11} (d) {5, 10, 15, 20}

User One Two Three
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Option d is the right answer which of the following is not a valid set? (a) {10, 11, 20, 21} (b) {12, 14, 16, 8} (c) {11, 22, 33, 11} (d) {5, 10, 15, 20}
User Fthiella
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