632
Do you know the answer?
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I argue it's still 25%, because the answer is either a,b,c, or d, you can only choose 1, regardless of the possible answer having two slots.
Yup. And it says pick at random. Not apply a bunch of bullshit self mastubatory lines of thinking. Ultimately, 1 of those answers are keyed as correct, 3 are not. It's 25% if you pick at random. If you're applying a bunch of logic into it you're no longer following the parameters anyway.
If you picked it randomly 100 times, would you be correct only 25% of time despite two choices being the same?
It must be a 50% chance.
But that would mean 50% is correct and....
Correct answer: all the answers in the multiple choice are wrong
You can just say "I don't understand probability (or the word 'if')" next time and save a whole bunch of effort.