Answer:
The probability that you win is 1/997002000
Step-by-step explanation:
The probability that the first number matches is 1/1000, because it is one out of 1000. For the second one it will be 1/999 because one number is removed. For the third one it is 1/998, thus, the probability that you win is
1/1000 * 1/999 * 1/998 = 1/997002000