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/sci/ - Science & Math

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1957376 No.1957376 [Reply] [Original]

halp /sci/!

i've got a calc 2 test tomorrow and this is on the practice test. i have no idea how to figure it out.

>Say whether the series converges or diverges
>sum(2^k/k!k) from k = 1 to infinity

tests we've covered so far are ratio test, root test, integral test, comparison test, limit comparison test, and divergence test

>> No.1957390

You have a factorial as well as a power function of k, correct?

Both of these should suggest the test that you are to use.

If you actually learned the material (which you should have), then you shouldn't have a problem deciding which test to use.

>> No.1957407

>>1957390
well my first guess was ratio test but that was inconclusive.

>> No.1957412

maybe i just screwed up somewhere in my ratio test

>> No.1957430
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1957430

oooook it converges by the ratio test. i messed up when i did it before. thanks /sci/!