यदि \(^{15}C_2\) से handshake गिने जा रहे हैं तो (2) से भाग का विचार क्या है?
If handshakes are counted by \(^{15}C_2\) what is the idea behind division by (2)?
Explanation opens after your attempt
A. व्यक्ति (A) से (B) और (B) से (A) एक ही handshake हैPerson (A) to (B) and (B) to (A) is the same handshake
Concept
A handshake is an unordered pair so (AB) and (BA) are not counted separately. In exams use combination when a pair has no direction.
Why this answer is correct
The correct answer is A. व्यक्ति (A) से (B) और (B) से (A) एक ही handshake है / Person (A) to (B) and (B) to (A) is the same handshake. A handshake is an unordered pair so (AB) and (BA) are not counted separately. In exams use combination when a pair has no direction.
Exam Tip
Handshake unordered pair है इसलिए (AB) और (BA) अलग नहीं गिने जाते। परीक्षा में pair की दिशा न हो तो combination लगाएँ।
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