Discussion

Explanation:

Given, a = (x + x3 + x5 + …) – (x2 + x4 + x6 + …) 

⇒ a = x1-x2 - x21-x2

⇒ a = x-x21-x2

⇒ a =x(1-x)(1+x)(1-x)

⇒ a = x(1+x)

⇒ a + ax = x

⇒ a = x(1 - a)

⇒ x = a/(1 - a)

Hence, option (a).

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