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To find the largest 3-digit number that can be formed using the digits 2, 1, and 4, we need to arrange these digits in descending order.
The digits are 2, 1, and 4.
Arranging them in descending order, we get 4, 2, 1.
Therefore, the largest 3-digit number that can be formed using the digits 2, 1, and 4 is 421.
Now, let's write each digit in the correct column/place value using the Place Value Chart:
- Hundreds place: 4
- Tens place: 2
- Ones place: 1
So, the largest 3-digit number that can be formed using the digits 2, 1, and 4 is 421.