(5) गणित और (4) भौतिकी पुस्तकों में से (5) पुस्तकें चुननी हैं, जिनमें ठीक (2) भौतिकी पुस्तकें हों। कितने चयन हैं?
From (5) mathematics and (4) physics books, (5) books are to be selected with exactly (2) physics books. How many selections are there?
Explanation opens after your attempt
B. (60)
Concept
For exactly (2) physics books use \(^{4}C_{2}\), and for (3) mathematics books use \(^{5}C_{3}\). Product is (60).
Why this answer is correct
The correct answer is B. (60). For exactly (2) physics books use \(^{4}C_{2}\), and for (3) mathematics books use \(^{5}C_{3}\). Product is (60).
Exam Tip
ठीक (2) भौतिकी के लिए \(^{4}C_{2}\) और (3) गणित के लिए \(^{5}C_{3}\)। गुणन से (60) मिलता है।
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