Randomly selecting a block to unanchor?

My current code creates a 6x5 grid of tiles, with an array that stores each brick in the grid. My question is, how could I make it so a randomly selected brick is unanchored? I have a random number 1-30, but I'm not sure how I can use that random value to select the brick I want to unanchor.

for i=1,30, 1 do
	Brick = Instance.new("Part")
	Brick.Name = i
	brickArray = {}
	table.insert(brickArray, i)
	Brick.Parent = workspace
	Brick.Anchored = true
	Brick.Size = Brick.Size + Vector3.new(20,0,22)
	Brick.BrickColor = BrickColor.Random()
	if i < 6 then
		Brick.CFrame = CFrame.new(24*i,0,0)
		elseif i < 12 then
		Brick.CFrame = CFrame.new(24*(i-6),0,24)
		elseif i < 18 then
		Brick.CFrame = CFrame.new(24*(i-12),0,48)
		elseif i < 24 then
		Brick.CFrame = CFrame.new(24*(i-18),0,72)
		elseif i < 30 then
		Brick.CFrame = CFrame.new(24*(i-24),0,96)
	end
	print(brickArray[1])
end

local random = math.ceil(math.random(0,30))

You can use the "math.random()" function to get a random address inside the table, how like this:

--> Made by Convexyz

local tab = {}; --> Your brick Table.

local selected = tab[math.random(1, #tab)];
selected.Anchored = false;