Which of the following series is called the “formal power series”?

1.	Which of the following series is called the “formal power series”?
A.	b₀+b₁x+b₂x²+…+bₙxⁿ
B.	b₁x+b₂x²+…+bₙxⁿ
C.	1/2b₀+1/3b₁x+1/4b₂x²+…+1/nbₙxⁿ
D.	n²(b₀+b₁x+b₂x²+…+bₙxⁿ)
Answer» B. b₁x+b₂x²+…+bₙxⁿ

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Which of the following series is called the “formal power series”?

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