How do I randomize Vector3?

I'm trying to organize my vectors into a table and I'm unsure what the problem it and why it won't pull out the vectors. Can someone help?

local vector1 = Vector3.new(-40, 50, 30)
local vector2 = Vector3.new(20, 60, 30)
local vector3 = Vector3.new(100, 60, 30)
local vector4 = Vector3.new(200, 60, 30)
local vector5 = Vector3.new(90, 40, -20)
--local vector6 =
--local vector7 =

local vectors = {vector1, vector2, vector3, vector4, vector5}

while true do
    wait(math.random(1,10))
    game.Workspace.Explosion:Play()
    explode = Instance.new("Explosion",game.Workspace)
    explode.BlastPressure = 5
    explode.BlastRadius = 20
    explode.ExplosionType = "NoCraters"
    explode.Position = math.random(1,#vectors)
end