Suppose X,Y∼Unif(0,1)X,Y \sim \text{Unif}(0,1)X,Y∼Unif(0,1) IID. Compute P[X−Y>1/2∣X+Y<1]\mathbb{P}[X - Y > 1/2 \mid X + Y < 1]P[X−Y>1/2∣X+Y<1].