What are all the values of x for which the series x minus x squared over 2 plus x cubed over 3 minus x to the 4th power over 4 + dot, dot, dot converges?

Question

What are all the values of x for which the series  converges?

A	−1 ≤ x ≤ 1
B	-1 ≤ x < 1
C	-1 < x ≤ 1
D	All reals

Answer 1

The series does not converge for x = -1, be cause for that value it becomes

-1 - 1/2 - 1/3 - 1/4 - ..., which is known not to converge.

Therefore none of the options besides C can be correct.