Change the numbers a bit to keep it simple. Flip a coin, 50% chance to get heads up on one toss. If you do that twice, you have the following equal possibilities:
* Heads+Heads
* Heads+Tails
* Tails+Heads
* Tails+Tails
So, 3 out of 4, or 75% chance to get one heads up. Which is different from a 2×50%=100% chance.
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