(12) विद्यार्थियों में से (9) विद्यार्थियों को चुनना (12) में से कितने विद्यार्थियों को न चुनने के बराबर है?
Selecting (9) students from (12) students is equal to not selecting how many students from (12)?
Explanation opens after your attempt
B. (3)
Concept
\(\binom{12}{9}=\binom{12}{3}\). Selecting (9) is the same as not selecting (3).
Why this answer is correct
The correct answer is B. (3). \(\binom{12}{9}=\binom{12}{3}\). Selecting (9) is the same as not selecting (3).
Exam Tip
\(\binom{12}{9}=\binom{12}{3}\) होता है। (9) चुनना (3) न चुनने के बराबर है।
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