প্রশ্নঃ A = 1, 2, 3}, B = {3, a, b} হলে, A ∪ B = কত?
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ক.{3, a, b}
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খ.{1, 2, 3}
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গ.{1, 2, 3, a, b}
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ঘ.{3}
উত্তরঃ গ
 {3, a, b} খ) {1, 2, 3} গ) {1, 2, 3, a, b} ঘ) {3} উত্তর: গ) {1, 2, 3, a, b}
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