What is the easiest way to Randomize randomizations?

I tried using the or function, but that just returned the first set of numbers and not the second, so it always spawn in the same general area. Is there an easy way to do this, or do I need to create random values that dictate these ones...

local pos = Vector3.new((math.random(-150,-25)or math.random(25,150)),0,(math.random(-150,-25)or math.random(25,150)))

While ImageLabel's way is very correct, I am going to go into further detail, and create a table of random numbers.

##So first, let's start by creating a table that will hold all of our numbers.

numbers = {}

##Great, now we can setup a function that's going to generate our table. Additional detail will be given in the comments.

function GenerateTable()
	checkNumber = false -- We will set this to true if the number already exists. Won't happen commonly, but just in case.
	for i = 1, 50 do -- Generate 50(ish) random numbers
		for _,v in pairs(numbers) do
			local randomNumber = math.random(0,100) -- Our random number
			if randomNumber == v then
				checkNumber = true --Uh oh, already exists. This is where the 50(ish) comes into play. If this happens, it will only generate 49 (unless it happens multiple times. Very unlikely).
			end
		end
		
		if not checkNumber then
			table.insert(numbers, randomNumber)
		end
	end
end

##Now that we have a random set of numbers, about 50 of them, we can refer back to ImageLabel's answer for the rest.

function generateNumber()
	return numbers[math.random(1,#numbers)]
end

######Note: This is all from general knowledge, none of this has been tested, and this is not the most efficient way. This is just a way to get you thinking.

Hope I helped.