(6) अलग-अलग पेन और (5) अलग-अलग पेंसिलों में से (4) वस्तुएं चुननी हैं जिनमें कम से कम (1) पेन और (1) पेंसिल हो। कितने तरीके हैं?
From (6) different pens and (5) different pencils (4) objects are to be selected with at least (1) pen and (1) pencil. How many ways are there?
Explanation opens after your attempt
C. (305)
Concept
Total ways are \(\binom{11}{4}=330\). Removing only pens \(\binom{6}{4}=15\) and only pencils \(\binom{5}{4}=5\) gives (310) ways.
Why this answer is correct
The correct answer is C. (305). Total ways are \(\binom{11}{4}=330\). Removing only pens \(\binom{6}{4}=15\) and only pencils \(\binom{5}{4}=5\) gives (310) ways.
Exam Tip
कुल \(\binom{11}{4}=330\) हैं। केवल पेन \(\binom{6}{4}=15\) और केवल पेंसिल \(\binom{5}{4}=5\) हटाने पर (310) तरीके मिलते हैं।
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