Given power series

∞

Σ

n =0

cnxn converges at x  =  9, which of the following must be true?

(i) The series converges at x  =  −2.

(ii) The series converges at x  =  −9.

(iii) The series diverges at x  =  11.

asked by guest
on Mar 16, 2026 at 9:10 am



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