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Determine a power series representation for the function g(x)=ln(7−x).(a) ∞∑n=0 x^n+1/7^n+1(b) ln(14)∞∑n=0 x^n+1/7n(c) ln(7)∞∑n=0 x^n+1/7^n+1(d) ln∞∑n=0 x/7^n+1I have been asked this question in an interview.I'm obligated to ask this question of Discrete Probability topic in section Discrete Probability of Discrete Mathematics

Answer»

The CORRECT CHOICE is (c) ln(7)∞∑n=0 x^n+1/7^n+1

The best EXPLANATION: We KNOW that ∫1/7−x dx=−ln(7−x) and there is a power series representation for 1/7−x. So, ln(7−x)=−∫1/7−xdx

=−∫ ∞∑n=0 x^n/7^n+1dx=C

⇒ ∞∑n=0 x^n+1/7^n+1

So, the answer is, ln(7−x)=ln(7)∞∑n=0 x^n+1/7^n+1.



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