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Which of the following series is called the “formal power series”?(a) b0+b1x+b2x^2+…+bnx^n(b) b1x+b2x^2+…+bnx^n(c) 1/2b0+1/3b1x+1/4b2x^2+…+1/nbnx^n(d) n^2(b0+b1x+b2x^2+…+bnx^n)I had been asked this question during an interview for a job.My enquiry is from Discrete Probability topic in chapter Discrete Probability of Discrete Mathematics

Answer»

Correct option is (a) b0+b1x+b2x^2+…+bnx^n

Easiest explanation: A formal power series is also CALLED a “formal series”, of a field F is an infinite SEQUENCE b0, b1, B2, … over F. It is a function from the set of nonnegative integers to F i.e., 0, 1, 2, 3, … → F. A formal power series can also be WRITTEN as b0+b1x+b2x^2+…+bnx^n.



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