Answer:
1/1,000
Step-by-step explanation:
The order of decimal places to the right is: hundredths(1/100), thousandths(1/1,000), ten thousandths(1/10,000)...
The 5 is in the hundredths place(5/100), the 1 is in the thousandths place(1/1,000), and the 2 is in the ten thousandths place(2/10,000).
So the answer is 1/1,000.
