(7) अलग पुस्तकों में से (4) पुस्तकें चुननी हैं, पर दो निर्धारित पुस्तकें साथ-साथ नहीं चुनी जा सकतीं। कितने चयन संभव हैं?
From (7) distinct books, (4) books are to be selected, but two specified books cannot be selected together. How many selections are possible?
Explanation opens after your attempt
B. (25)
Concept
Total selections are \(^{7}C_{4}=35\). If both specified books are together, \(^{5}C_{2}=10\) selections are removed.
Why this answer is correct
The correct answer is B. (25). Total selections are \(^{7}C_{4}=35\). If both specified books are together, \(^{5}C_{2}=10\) selections are removed.
Exam Tip
कुल \(^{7}C_{4}=35\) हैं। दोनों निर्धारित पुस्तकें साथ होने पर \(^{5}C_{2}=10\) चयन हटेंगे।
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