Question:medium
If \( ^nC_{r-1}=36, ^nC_r=84, ^nC_{r+1}=126 \), then \( n= \)
If \( ^nC_{r-1}=36, ^nC_r=84, ^nC_{r+1}=126 \), then \( n= \)
Show Hint
Use ratios to eliminate factorial complexity.
Updated On: May 1, 2026
- \( 3 \)
- \( 4 \)
- \( 8 \)
- \( 9 \)
- \( 10 \)
Show Solution
The Correct Option is D
Solution and Explanation
Was this answer helpful?
0
Top Questions on Combinations
- A committee of 11 members is to be formed out of 8 males and 5 females. If \( m \) is the number of ways the committee is formed with at least 6 males and \( n \) is the number of ways with at least 3 females, then:
- MHT CET - 2024
- Mathematics
- Combinations
- In how many ways can a student choose a programme of 5 courses if 9 courses are available and 2 specific courses are compulsory for every student?
- CBSE Class XI
- Mathematics
- Combinations
- A bag contains 5 black and 6 red balls. Determine the number of ways in which 2 black and 3 red balls can be selected.
- CBSE Class XI
- Mathematics
- Combinations
- In how many ways can one select a cricket team of eleven from 17 players in which only 5 players can bowl if each cricket team of 11 must include exactly 4 bowlers?
- CBSE Class XI
- Mathematics
- Combinations
- Want to practice more? Try solving extra ecology questions todayView All Questions
