Blueprint Obstacle Spawn Array variation

Development Programming & Scripting Blueprint
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Hello, noob question:

I have a track section for an endless runner where obstacles spawn. However, I don’t want to spawn all of the obstacles at once; I want to vary the number of obstacles randomly. How do I wire this up?
Right now, they either all spawn at the same time or none at all.

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Make an array of all the obstacles ( what are they, meshes? ), and then use the RANDOM node to choose one randomly.