Q3 (5 points) (5 marks) Show that the ratio test fails to apply to the series co 2 2-n+(1) n=1 but that the root test does apply. Determine if...

How to solve this question? Can someone help with me? Thanks !!!!

Q3 (5 points) (5 marks) Show that the ratio test fails to apply to the series co2 2-n+(—1)"n=1 but that the root test does apply. Determine if the series converges or not.