यदि (|A|=6) है, तो (\mathcal{P}(A)) में ठीक (4) तत्वों वाले सदस्यों की संख्या कितनी है?
If (|A|=6), how many members of (\mathcal{P}(A)) have exactly (4) elements?
Explanation opens after your attempt
Correct Answer
B. (15)
Concept
The number of such subsets is \(\binom{6}{4}=15\). In exams, use \(\binom{6}{4}=\binom{6}{2}\) for faster calculation.
Why this answer is correct
The correct answer is B. (15). The number of such subsets is \(\binom{6}{4}=15\). In exams, use \(\binom{6}{4}=\binom{6}{2}\) for faster calculation.
Exam Tip
ऐसे subsets की संख्या \(\binom{6}{4}=15\) होती है। परीक्षा में \(\binom{6}{4}=\binom{6}{2}\) का प्रयोग तेज गणना के लिए करें।
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