(5) गणित, (4) भौतिकी और (3) रसायन पुस्तकों में से (5) पुस्तकें चुननी हैं जिनमें हर विषय की कम से कम (1) पुस्तक हो। कितने तरीके हैं?

From (5) mathematics, (4) physics, and (3) chemistry books, (5) books are to be selected with at least (1) book from each subject. How many ways are there?

Explanation opens after your attempt
Correct Answer

A. (621)

Step 1

Concept

Subtract selections missing at least one subject from \(\binom{12}{5}=792\). The correct count is (621).

Step 2

Why this answer is correct

The correct answer is A. (621). Subtract selections missing at least one subject from \(\binom{12}{5}=792\). The correct count is (621).

Step 3

Exam Tip

कुल \(\binom{12}{5}=792\) में से किसी विषय के न होने वाले चयन घटाएं। सही गिनती (621) है।

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Mathematics Answer, Explanation and Revision Hints

(5) गणित, (4) भौतिकी और (3) रसायन पुस्तकों में से (5) पुस्तकें चुननी हैं जिनमें हर विषय की कम से कम (1) पुस्तक हो। कितने तरीके हैं? / From (5) mathematics, (4) physics, and (3) chemistry books, (5) books are to be selected with at least (1) book from each subject. How many ways are there?

Correct Answer: A. (621). Explanation: कुल \(\binom{12}{5}=792\) में से किसी विषय के न होने वाले चयन घटाएं। सही गिनती (621) है। / Subtract selections missing at least one subject from \(\binom{12}{5}=792\). The correct count is (621).

Which concept should I revise for this Mathematics MCQ?

Subtract selections missing at least one subject from \(\binom{12}{5}=792\). The correct count is (621).

What exam hint can help solve this Mathematics question?

कुल \(\binom{12}{5}=792\) में से किसी विषय के न होने वाले चयन घटाएं। सही गिनती (621) है।