(6) अलग-अलग रेखाएं और (5) अलग-अलग वृत्त हैं। दो आकृतियां चुननी हैं जिनमें कम से कम एक रेखा हो। कितने चयन हैं?
There are (6) distinct lines and (5) distinct circles. Two figures are to be selected with at least one line. How many selections are possible?
Explanation opens after your attempt
C. (55)
Concept
Subtract circle-only selections \(^{5}C_{2}=10\) from total \(^{11}C_{2}=55\). The correct count is (45).
Why this answer is correct
The correct answer is C. (55). Subtract circle-only selections \(^{5}C_{2}=10\) from total \(^{11}C_{2}=55\). The correct count is (45).
Exam Tip
कुल \(^{11}C_{2}=55\) से केवल वृत्त \(^{5}C_{2}=10\) घटाने चाहिए। सही संख्या (45) है।
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