(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
Correct Answer

C. (112)

Step 1

Concept

Total ways are \(\binom{10}{3}=120\), and ways with both particular photos are \(\binom{8}{1}=8\). Thus (120-8=112) ways.

Step 2

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.

Step 3

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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(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?

Correct Answer: C. (112). Explanation: 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। / Total ways are \(\binom{10}{3}=120\), and ways with both particular photos are \(\binom{8}{1}=8\). Thus (120-8=112) ways.

Which concept should I revise for this Mathematics MCQ?

Total ways are \(\binom{10}{3}=120\), and ways with both particular photos are \(\binom{8}{1}=8\). Thus (120-8=112) ways.

What exam hint can help solve this Mathematics question?

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।