Let f(x,y)=1f(x, y) = 1f(x,y)=1 for 0≤x,y≤10 \leq x, y \leq 10≤x,y≤1. Find P(X+Y<0.5)P(X+Y < 0.5)P(X+Y<0.5).
1/81/81/8
1/41/41/4
1/21/21/2
1/161/161/16