JEE Mains · Maths · STD 11 - 7. binomial theoram
The ratio of the coefficient of the middle term in the expansion of \((1+x)^{20}\) and the sum of the coefficients of two middle terms in expansion of \((1+x)^{19}\) is \(....\)
- A \(5\)
- B \(4\)
- C \(1\)
- D \(11\)
Answer & Solution
Correct Answer
(C) \(1\)
Step-by-step Solution
Detailed explanation
Coeff. of middle term in \((1+x)^{20}={ }^{20} C_{10}\) Sum of Coeff. of two middle terms in \((1+x)^{19}={ }^{19} C_{9}+{ }^{19} C_{10}\) So required ratio…
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