Final answer:
The largest two-digit number that can be formed from the digits 2, 9, 1, and 3 is 93, with 9 in the tens place and 3 in the ones place.
Step-by-step explanation:
To create the largest possible two-digit number from the digits 2, 9, 1, and 3, we need to follow a basic rule in numbers: A larger digit in the tens place will make the number larger. Among the given digits, 9 is the largest. Therefore, 9 should be placed in the tens place. The next largest digit is 3, which should be placed in the ones place. Consequently, the largest two-digit number that can be formed with two of the given digits is 93.