Thread: series converges.

Hi, I know this series converges.

n^4 * 2^-n

i used the direct comparison test with 1/2^n

however, i'm not sure why n^4 would = 1.

thanks for any help.

Originally Posted by rcmango

Hi, I know this series converges.

n^4 * 2^-n

i used the direct comparison test with 1/2^n

however, i'm not sure why n^4 would = 1.

thanks for any help.

I personally would use the ratio test



so the series converges.