You Do Need power plug adapter while traveling from Cocos (Keeling) Islands to Bolivia.

Here is Why You Need An Adapter

The outlet and plug type used in Bolivia are A and C and in Cocos (Keeling) Islands is I. This is how they look like.

In Cocos (Keeling) Islands, outlets of type I are in use.

Type I

In Bolivia, outlets of type A and C are in use.

Type A

Type C

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