Question

1-2x + 3x² - 4x³ + 5x⁴- 6x⁵ + ....-1 <x < 1 equals

a)1/x²
b)1/(1-x)²
c)1/(1+x)²
d)none
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Answer 1

Answer:

b) 1/(1+x)² is the correct answer.