algebra

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

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  1. ∑ (-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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    Reiny

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