1.

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

A. b<sub>0</sub>+b<sub>1</sub>x+b<sub>2</sub>x<sup>2</sup>+ +b<sub>n</sub>x<sup>n</sup>
B. b<sub>1</sub>x+b<sub>2</sub>x<sup>2</sup>+ +b<sub>n</sub>x<sup>n</sup>
C. 1/2b<sub>0</sub>+1/3b<sub>1</sub>x+1/4b<sub>2</sub>x<sup>2</sup>+ +1/nb<sub>n</sub>x<sup>n</sup>
D. n<sup>2</sup>(b<sub>0</sub>+b<sub>1</sub>x+b<sub>2</sub>x<sup>2</sup>+ +b<sub>n</sub>x<sup>n</sup>)
Answer» B. b<sub>1</sub>x+b<sub>2</sub>x<sup>2</sup>+ +b<sub>n</sub>x<sup>n</sup>


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