Let’s imagine you are rolling the dice and you need to get 6. In the perfect world, if you roll it many times, number 6 should appear in 16,67% of cases, i.e., every sixth time (since the dice has six faces), right?
In real life, you can get lucky, and the number 6 will appear a few times in a row if you experiment.
The process of solution searching in mining is equivalent to rolling the dice, even though it sounds strange. You are competing with the whole world, but the point doesn’t change.
Let’s say you have one video card, and your friend has 6-GPU Mining Rig, this is equivalent to you having one dice, and him having six dices. You roll each dice once and try to get six.
Apparently, your friend has much more (nine times more) chances of getting six, but it doesn’t mean you can’t win. Let’s suppose that the reward for one block is $100. You can unite with your friend and find the block together, and divide the gainings in a fair way – you get $10, and his part is $90.
Or you can search for the block on your own, and then you get the whole $100 for yourself for the found block. In the perfect world, it would take ten times more time, than if you cooperate with your friend, but our world isn’t ideal.