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I need help on questions 17, 21, and 25. Thanks!

In Exercises 9-24, a power series is given. (a) Find the radius of convergence. (b) Find the interval of convergence.

17. Σvnx n=0 18. Σ n=0 19. 31 (x – 5) n! n=0 20. Σ(-1)n!(x – 10) n=0 21. η2 n=1

In Exercises 25 – 30, a function f(x) = ax is given. (a) Give a power series for f(x) and its interval of conver- gence. (b

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rithalal a condition for convergent a) i. Radius of convergence R= 1--1) 이 Eox 에 Vh에 께 9nt = Ji N Rao와。 antl 1 = m ) if Lel SSi 4X G 3 a) f(x)= d. E non Jx no $(x) = n lang ta) noo f(x)= an Q=4 با (دیر) RGT f (1-4X) 3 = (*),5 no 6) Socx) = s & nxn

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I need help on questions 17, 21, and 25. Thanks! In Exercises 9-24, a power series...
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