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This is what I came up with
You have 100% chance of getting 10 questions right.
That means you only need to correctly answer 14 more.
With a 20% probability of guessing correctly, you would have a probability of (0.2)^14 of passing.
That's a 1.64*10^-8 % chance. Doesn't look good if you're serious (and if I didn't butcher math).
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