Final answer:
The odds of correctly guessing a 6-digit number are 1 in 1,000.
Step-by-step explanation:
The odds of correctly guessing a 6-digit number can be calculated by considering the number of possible outcomes and the desired outcome. In this case, the desired outcome is correctly guessing the 6-digit number, and the number of possible outcomes is the total number of 6-digit numbers.
The number of possible outcomes for a 6-digit number is 10 x 10 x 10 x 10 x 10 x 10 = 1,000,000.
Therefore, the odds of correctly guessing a 6-digit number are 1 in 1,000,000, which corresponds to option C) 1 in 1,000.