Ononot — Suppose a point (X, Y) is chosen uniformly at random from th

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Conditional Probabilityhard

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Suppose a point $(X, Y)$ is chosen uniformly at random from the region defined by $0 \leq x \leq 1$ and $0 \leq y \leq 1$ . Given that $X + Y \leq 1$ , what is the probability that $X^2 + Y^2 \leq \frac{1}{4}$ ?