The largest 4-digit number that can be put together using the digits 1, 7, 2 and 5 is
To form the largest number using the digits 1, 7, 2 and 5, we need to arrange the digits in descending order.
7 > 5 > 2 > 1
Hence on arranging the digits in descending order, we get 7521, which is the largest 4 digit number that can be formed using the digits 1, 7, 2 and 5.