(10) सफेद और (11) काली गेंदों में से (7) गेंदें चुननी हैं जिनमें सभी गेंदों का रंग समान न हो। कितने तरीके हैं?

From (10) white and (11) black balls (7) balls are to be selected such that all balls are not of the same color. How many ways are there?

Explanation opens after your attempt
Correct Answer

B. (115830)

Step 1

Concept

Total ways are \(\binom{21}{7}=116280\). Removing all-white \(\binom{10}{7}=120\) and all-black \(\binom{11}{7}=330\) gives (115830).

Step 2

Why this answer is correct

The correct answer is B. (115830). Total ways are \(\binom{21}{7}=116280\). Removing all-white \(\binom{10}{7}=120\) and all-black \(\binom{11}{7}=330\) gives (115830).

Step 3

Exam Tip

कुल \(\binom{21}{7}=116280\) हैं। सभी सफेद \(\binom{10}{7}=120\) और सभी काली \(\binom{11}{7}=330\) हटाने पर (115830) मिलते हैं।

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Mathematics Answer, Explanation and Revision Hints

(10) सफेद और (11) काली गेंदों में से (7) गेंदें चुननी हैं जिनमें सभी गेंदों का रंग समान न हो। कितने तरीके हैं? / From (10) white and (11) black balls (7) balls are to be selected such that all balls are not of the same color. How many ways are there?

Correct Answer: B. (115830). Explanation: कुल \(\binom{21}{7}=116280\) हैं। सभी सफेद \(\binom{10}{7}=120\) और सभी काली \(\binom{11}{7}=330\) हटाने पर (115830) मिलते हैं। / Total ways are \(\binom{21}{7}=116280\). Removing all-white \(\binom{10}{7}=120\) and all-black \(\binom{11}{7}=330\) gives (115830).

Which concept should I revise for this Mathematics MCQ?

Total ways are \(\binom{21}{7}=116280\). Removing all-white \(\binom{10}{7}=120\) and all-black \(\binom{11}{7}=330\) gives (115830).

What exam hint can help solve this Mathematics question?

कुल \(\binom{21}{7}=116280\) हैं। सभी सफेद \(\binom{10}{7}=120\) और सभी काली \(\binom{11}{7}=330\) हटाने पर (115830) मिलते हैं।