AP EAMCET · Maths · Binomial Theorem
If the coefficients of \(r\) th and \((r+1)\) th terms in the expansion of \((3+7 x)^{29}\) are equal, then \(r\) is equal to
- A 14
- B 15
- C 18
- D 21
Answer & Solution
Correct Answer
(D) 21
Step-by-step Solution
Detailed explanation
Coefficient of \(r\) th term \(=\) Coefficient of \((r+1)\) th term \(\therefore{ }^{29} C_{r-1}(3)^{29-r+1}(7)^{r-1}={ }^{29} C_r(3)^{29-r}(7)^r\)…
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