निम्नलिखित में से कौन-से रिक्त समुच्चय के उदाहरण हैं? (A) \( \{x: x \in N, x7 \) और \( x9\} \) (...

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निम्नलिखित में से कौन-से रिक्त समुच्चय के उदाहरण हैं?
(A) \( \{x: x \in N, x7 \) और \( x9\} \)
(B) \( \{x: x \) दो लम्बवत् रेखाओं का उभयनिष्ठ बिन्दु है \( \} \)
(C) 3 से विभाज्य सम प्राकृतिक संख्याओं का समुच्चय
(D) \( \left\{x: x^{2}=4, x\right. \) एक विषम संख्या है \( \} \)
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