यदि \( \mathrm{A}=\{1,2,3,4\}, \mathrm{B}=\{3,4,5,6\}, \mathrm{C}=\{5,6,7,8\} \) और \( \mathrm{D...

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यदि \( \mathrm{A}=\{1,2,3,4\}, \mathrm{B}=\{3,4,5,6\}, \mathrm{C}=\{5,6,7,8\} \) और \( \mathrm{D}=\{7,8,9,10\} \), तो निम्नलिखित ज्ञात कीजिए:
\( A \cup B \)
\( A \cup B \cup C \)
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