(6) वरिष्ठ और (4) कनिष्ठ विद्यार्थियों में से (4) सदस्य चुनने हैं जिनमें ठीक (3) वरिष्ठ और (1) कनिष्ठ हो। कुल चयन कितने हैं?
From (6) seniors and (4) juniors, (4) members are chosen with exactly (3) seniors and (1) junior. How many selections are possible?
Explanation opens after your attempt
Correct Answer
B. (80)
Concept
The count is \( \binom{6}{3}\binom{4}{1}=80 \). For selections from separate groups, use the multiplication rule.
Why this answer is correct
The correct answer is B. (80). The count is \( \binom{6}{3}\binom{4}{1}=80 \). For selections from separate groups, use the multiplication rule.
Exam Tip
गिनती \( \binom{6}{3}\binom{4}{1}=80 \) है। अलग समूहों से चयन में गुणन नियम लगाएँ।
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