(11) किताबों में से (4) किताबें चुननी हैं जिनमें दो विशेष किताबें एक साथ नहीं आनी चाहिए। कितने तरीके हैं?
From (11) books (4) books are to be selected so that two special books do not appear together. How many ways are there?
Explanation opens after your attempt
C. (285)
Concept
Total ways are \(\binom{11}{4}=330\) and ways with both special books are \(\binom{9}{2}=36\). Hence the correct count is (294).
Why this answer is correct
The correct answer is C. (285). Total ways are \(\binom{11}{4}=330\) and ways with both special books are \(\binom{9}{2}=36\). Hence the correct count is (294).
Exam Tip
कुल \(\binom{11}{4}=330\) हैं और दोनों विशेष साथ हों तो \(\binom{9}{2}=36\) तरीके हैं। इसलिए (330-36=294) नहीं बल्कि सही गणना (294) है।
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