## Algebra 2 (1st Edition)

$\approx0.727$
The number of all possible selections is: $20\cdot20\cdot20\cdot20=160000$. The number of all possible selections where we select different items is: $20\cdot19\cdot18\cdot17=116280$. Hence the probability: $\frac{116280}{160000} \approx0.727$