(9) विद्यार्थियों में से (4) चुनने हैं और दो विशेष विद्यार्थी दोनों साथ में अवश्य चुने जाएं। कितने तरीके हैं?
From (9) students, (4) are to be selected and two special students must both be included. How many ways are there?
Explanation opens after your attempt
Correct Answer
B. (21)
Concept
The two special students are already selected. The remaining (2) students are chosen from (7) in \(\binom{7}{2}=21\) ways.
Why this answer is correct
The correct answer is B. (21). The two special students are already selected. The remaining (2) students are chosen from (7) in \(\binom{7}{2}=21\) ways.
Exam Tip
दो विशेष विद्यार्थी पहले से चुने हैं। बाकी (2) विद्यार्थी (7) में से \(\binom{7}{2}=21\) तरीकों से चुने जाएंगे।
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