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JEE Mains · Maths · STD 11 - 7. binomial theoram

જો  \((1+x)^{p}(1-x)^{q}, p, q \leq 15\) ના વિસ્તરણમાં  \(x\) અને \(x^{2}\) ના સહગુણકો અનુક્રમે \(-3\) અને \(-5\) હોય તો \(x ^{3}\) નો સહગુણક \(............\) થાય.

  1. A \(22\)
  2. B \(23\)
  3. C \(52\)
  4. D \(53\)
Verified Solution

Answer & Solution

Correct Answer

(B) \(23\)

Step-by-step Solution

Detailed explanation

Since coefficient of \(x\) is \(-3\) \({ }^{p} C _{1}-{ }^{9} C _{1}=-3\) \(p - q =-3\) \(\text { Comparing coefficients of } x ^{2}\) \({ }^{9} C _{1}{ }^{9} C _{1}+{ }^{ p } C _{2}+{ }^{9} C _{2}=-5\) \(- pq +\frac{ p ( p -1)}{2}+\frac{ q ( q -1)}{2}=-5\) Solving \((1)\) and…
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