Final answer:
In middle digit filing, the number 761600 would be filed last because it has the same middle and first digits as 761601, but a lower last digit.
Step-by-step explanation:
In middle digit filing, the number that would be filed last is 761600. Middle digit filing generally refers to a filing system where you sequence files based on the middle digits of a given number. We start by looking at the middle digits of each number, followed by the first and last digits if necessary, to determine the sequence.
For example, here are the numbers provided with their middle digits highlighted:
Comparing the middle digits, we see that 15 and 16 are involved, specifically 160 in two instances. If the middle digits are the same, we then compare the first and last digits in sequence. The numbers 761601 and 761600 have the same middle and first digits, but the last digit in 761600 is lower than 761601, which means it would be filed after 761601, making it the last number to be filed. Therefore, the correct answer is 761600.