Gujarati
8. Sequences and Series
easy

यदि $y = x + {x^2} + {x^3} + .......\,\infty ,\,$ तब $x = $

A

$\frac{y}{{1 + y}}$

B

$\frac{{1 - y}}{y}$

C

$\frac{y}{{1 - y}}$

D

इनमें से कोई नहीं

Solution

(a) $y = \frac{x}{{1 – x}}$, (अनन्त गुणोत्तर श्रेणी के लिये)

$\therefore y – yx = x$ या $y = x\,(1 + y)$,

अर्थात् $x = \frac{y}{{1 + y}}$

Standard 11
Mathematics

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