(4) नीली और (6) हरी पेंसिलों में से कुल (3) पेंसिल चुननी हैं जिनमें ठीक (2) हरी हों। कितने तरीके हैं?
From (4) blue and (6) green pencils, (3) pencils are to be selected with exactly (2) green pencils. How many ways are there?
Explanation opens after your attempt
C. (60)
Concept
Exactly (2) green and (1) blue are needed. The ways are \(\binom{6}{2}\binom{4}{1}=15\cdot4=60\).
Why this answer is correct
The correct answer is C. (60). Exactly (2) green and (1) blue are needed. The ways are \(\binom{6}{2}\binom{4}{1}=15\cdot4=60\).
Exam Tip
ठीक (2) हरी और (1) नीली चाहिए। तरीके \(\binom{6}{2}\binom{4}{1}=15\cdot4=60\) हैं।
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