A point $(x,y)$ is randomly selected such that $0 \leq x \leq 3$ and $0 \leq y \leq 6$. What is the probability that $x + y \leq 4$? Express your answer as a common fraction.
Please show your work!!!
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The trapezoid is a triangle + a rectangle. The probability is $\frac{\text{area of trapezoid}}{3*6}$