AP EAMCET · Maths · Permutation Combination
If \({ }^n C_{r-1}=330,{ }^n C_r=462\), and \({ }^n C_{r+1}=462\), then \(r\) is equal to
- A \(3\)
- B \(4\)
- C \(5\)
- D \(6\)
Answer & Solution
Correct Answer
(C) \(5\)
Step-by-step Solution
Detailed explanation
Given, \[ { }^n C_{r-1}=330,{ }^n C_r=462 \] and \(\quad{ }^n C_{r+1}=462\) Now, \(\quad \frac{{ }^n C_{r+1}}{{ }^n C_r}=1\)…
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