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