Subject: mathqa
Question: denise is trying to open a safe whose combination she does not know . if the safe has 4000 possible combinations , and she can try 75 different possibilities , what is the probability that she does not pick the one correct combination .
Option: 
A: 4 3 / 160
B: 159 / 160
C: 1
D: 157 / 160
Answer: D