(5) पंक्तियों और (6) स्तंभों वाले छोटे वर्गों के ग्रिड में कुल कितने आयत बनेंगे?
How many rectangles are there in a grid of small squares with (5) rows and (6) columns?
Explanation opens after your attempt
C. (315)
Concept
For a rectangle, choose (2) horizontal lines from (6) and (2) vertical lines from (7). The count is \(^{6}C_{2}\times{}^{7}C_{2}=315\).
Why this answer is correct
The correct answer is C. (315). For a rectangle, choose (2) horizontal lines from (6) and (2) vertical lines from (7). The count is \(^{6}C_{2}\times{}^{7}C_{2}=315\).
Exam Tip
आयत के लिए (6) क्षैतिज रेखाओं में से (2) और (7) ऊर्ध्व रेखाओं में से (2) चुनें। संख्या \(^{6}C_{2}\times{}^{7}C_{2}=315\)।
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