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Consider the infinite geometric series below.

a. Write the first 4 terms of the series
b. Does the series diverge or converge?
c. If the series has a sum, find the sum.
∞
∑ (-2)^n-1
n=2

1 answer

∞
∑ (-2)^n-1
n=2
= -2 + 4 - 8 + 16 - ...

= (-2+4) + (-8+16) + (-32+64) ....
= 2 + 8 + 32 + ...

so what do you think ?
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