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JEE Mains · Maths · STD 11 - 8. sequence and series

यदि \(|x|<1,|y|<1\) और \(x \neq y\), तो निम्नलिखित अनंत श्रेणी \((x+y)+\left(x^{2}+x y+y^{2}\right)+\left(x^{3}+x^{2} y+x y^{2}+y^{3}\right)+\ldots \quad\) कI योगफल है

  1. A \(\frac{x+y-x y}{(1-x)(1-y)}\)
  2. B \(\frac{x+y-x y}{(1+x)(1+y)}\)
  3. C \(\frac{x+y+x y}{(1+x)(1+y)}\)
  4. D \(\frac{x+y+x y}{(1-x)(1-y)}\)
Verified Solution

Answer & Solution

Correct Answer

(A) \(\frac{x+y-x y}{(1-x)(1-y)}\)

Step-by-step Solution

Detailed explanation

\(|x|<1,|y|<1, x \neq y\) \((x+y)+\left(x^{2}+x y+y^{2}\right)+\left(x^{3}+x^{2} y+x y^{2}+y^{3}\right)\) \(+\ldots \ldots \ldots\) By multiplying and dividing \(x-y:\) \(\frac{\left(x^{2}-y^{2}\right)+\left(x^{3}-y^{3}\right)+\left(x^{4}-y^{4}\right)+\ldots \ldots}{x-y}\)…
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