(4) वरिष्ठ और (5) कनिष्ठ विद्यार्थियों में से (2) वरिष्ठ और (1) कनिष्ठ कितने तरीकों से चुने जा सकते हैं?
From (4) senior and (5) junior students, in how many ways can (2) senior and (1) junior students be selected?
Explanation opens after your attempt
C. (30)
Concept
The ways are \(\binom{4}{2}\binom{5}{1}=6\cdot5=30\). Selections from different categories are multiplied.
Why this answer is correct
The correct answer is C. (30). The ways are \(\binom{4}{2}\binom{5}{1}=6\cdot5=30\). Selections from different categories are multiplied.
Exam Tip
तरीके \(\binom{4}{2}\binom{5}{1}=6\cdot5=30\) हैं। अलग श्रेणियों का चयन गुणा से जुड़ता है।
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