(10) अलग-अलग फोटो में से (3) फोटो चुननी हैं जिनमें दो खास फोटो दोनों साथ न आएं। कितने तरीके हैं?
From (10) different photos, (3) photos are to be selected so that two particular photos do not both appear together. How many ways are there?
Explanation opens after your attempt
C. (112)
Concept
Total ways are \(\binom{10}{3}=120\), and ways with both particular photos are \(\binom{8}{1}=8\). Thus (120-8=112) ways.
Why this answer is correct
The correct answer is C. (112). Total ways are \(\binom{10}{3}=120\), and ways with both particular photos are \(\binom{8}{1}=8\). Thus (120-8=112) ways.
Exam Tip
कुल \(\binom{10}{3}=120\) हैं और दोनों खास फोटो साथ हों तो \(\binom{8}{1}=8\) तरीके हैं। इसलिए (120-8=112) तरीके हैं।
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