(5) सफेद और (7) काली गेंदों में से कुल (4) गेंदें चुननी हैं जिनमें सभी काली हों। कितने तरीके हैं?

From (5) white and (7) black balls, (4) balls are to be selected and all must be black. How many ways are there?

Explanation opens after your attempt
Correct Answer

B. (35)

Step 1

Concept

All balls must be black, so there are \(\binom{7}{4}=35\) ways. The white balls are not used.

Step 2

Why this answer is correct

The correct answer is B. (35). All balls must be black, so there are \(\binom{7}{4}=35\) ways. The white balls are not used.

Step 3

Exam Tip

सभी काली गेंदें चाहिए इसलिए \(\binom{7}{4}=35\) तरीके हैं। बाकी सफेद गेंदों का प्रयोग नहीं होगा।

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FAQs

Mathematics Answer, Explanation and Revision Hints

(5) सफेद और (7) काली गेंदों में से कुल (4) गेंदें चुननी हैं जिनमें सभी काली हों। कितने तरीके हैं? / From (5) white and (7) black balls, (4) balls are to be selected and all must be black. How many ways are there?

Correct Answer: B. (35). Explanation: सभी काली गेंदें चाहिए इसलिए \(\binom{7}{4}=35\) तरीके हैं। बाकी सफेद गेंदों का प्रयोग नहीं होगा। / All balls must be black, so there are \(\binom{7}{4}=35\) ways. The white balls are not used.

Which concept should I revise for this Mathematics MCQ?

All balls must be black, so there are \(\binom{7}{4}=35\) ways. The white balls are not used.

What exam hint can help solve this Mathematics question?

सभी काली गेंदें चाहिए इसलिए \(\binom{7}{4}=35\) तरीके हैं। बाकी सफेद गेंदों का प्रयोग नहीं होगा।