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If you’re reading this sentence, then propositional logic is meant for you. It's time to demystify the art of formal logic!

The image above has five XOR gates. XOR gates output a 1 if the inputs are a 1 and a 0, otherwise it outputs a 0.

What's the output at the end?

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In the image above there are three AND gates and two OR gates. What's the question mark?

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If A, B, and C are assigned values of 0 or 1 randomly and independently, what is the probability that the above diagram will be correct?

**HINT:** Of the 8 possible sets of inputs, 4 involve \( C = 1 \) and 4 involve \( C = 0 .\) Treat them separately.

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What is C?

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