I can't say how many computer you need to mine a lot of bitcoins but what I know is if you have ASIC miner, you might be able to mine good amount of bitcoin. You might hve to spend over a thousand dollars, though
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You are right about using the multiple computers in the mining process. The power of the hardware is what matters. The power of the hardware will tell alot about the mining speed.Mining, does not really mean the usage of multiple computers in other to have as much as possible but the facts is that a single mining computer can even be more better of than the multiple devices used.
Well, I mining any cryptocurrency there is no consideration to the numbers of computers will be used for the mining, the only consideration sometimes is on the expenditure that will be on the use of power consumption.