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Let X = {1, {1}, {1, 2}, 2, {3}, 4 }. Which statements are true? (a) 2 X (b) {2} X (c) {2} X (d)

Let X = {1, {1}, {1, 2}, 2, {3}, 4 }. Which statements are true?

(a) 2 X

(b) {2} X

(d) 3 X

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