A blow to the head can cause a brain aneurysm, but this cause is only 1% of all cases, so it's unlikely.
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In a penetrating head injury, an object such as a bullet fractures the skull and enters brain tissue.
The theoretical probability of getting one head and one tail is 50%
The probability of tossing a coin and getting heads is 0.5
285 out of 500
Just one head = 2/4 = 1/2