Final answer:
Factory G must be inspected on day 1 because it has to be inspected before factories F and R, and since another factory, J, is already scheduled for day 3.
Step-by-step explanation:
To determine on which day factory G is inspected, we have to consider the given conditions:
- F is inspected after G and before R.
- J is inspected on day 3.
- H is not inspected on day 6.
Since F is inspected after G, G cannot be inspected on the last day, day 6. Additionally, because F must also come before R, G must be inspected even earlier. With J being inspected on day 3, this leaves only the first two days as options for G's inspection.
Therefore, the correct answer is: a) Day 1