Sorry, I had a bit of a brainfart when writing that. You can add the probabilities simply because (1 - e - f) is a good approximation for (1 - e)(1 - f) when e and f are tiny. No other reason. The chance of having "two" collisions (I meant one existing collision) is zero because we were in a case that assumed that.
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Sorry, I had a bit of a brainfart when writing that. You can add the probabilities simply because (1 - e - f) is a good approximation for (1 - e)(1 - f) when e and f are tiny. No other reason. The chance of having "two" collisions (I meant one existing collision) is zero because we were in a case that assumed that.