(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
Correct Answer

C. (60)

Step 1

Concept

Exactly (2) green and (1) blue are needed. The ways are \(\binom{6}{2}\binom{4}{1}=15\cdot4=60\).

Step 2

Why this answer is correct

The correct answer is C. (60). Exactly (2) green and (1) blue are needed. The ways are \(\binom{6}{2}\binom{4}{1}=15\cdot4=60\).

Step 3

Exam Tip

ठीक (2) हरी और (1) नीली चाहिए। तरीके \(\binom{6}{2}\binom{4}{1}=15\cdot4=60\) हैं।

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Mathematics Answer, Explanation and Revision Hints

(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?

Correct Answer: C. (60). Explanation: ठीक (2) हरी और (1) नीली चाहिए। तरीके \(\binom{6}{2}\binom{4}{1}=15\cdot4=60\) हैं। / Exactly (2) green and (1) blue are needed. The ways are \(\binom{6}{2}\binom{4}{1}=15\cdot4=60\).

Which concept should I revise for this Mathematics MCQ?

Exactly (2) green and (1) blue are needed. The ways are \(\binom{6}{2}\binom{4}{1}=15\cdot4=60\).

What exam hint can help solve this Mathematics question?

ठीक (2) हरी और (1) नीली चाहिए। तरीके \(\binom{6}{2}\binom{4}{1}=15\cdot4=60\) हैं।