The largest six-digit number using digits 5,3,4,7,0,8 once each is 875403.
Step 1: Write the digits we can use: 0, 3, 4, 5, 7, 8.
Step 2: To make the largest number, we put the biggest digits first (descending order).
Step 3: Arrange the digits from biggest to smallest: 8, 7, 5, 4, 3, 0.
Step 4: Make the number by placing them in this order.
Number = 875430
Step 5: Check the given number in the statement: 875403.
It uses the same digits, but the last two places are swapped (…30 vs …03).
Conclusion: The largest number is 875430, not 875403. So the statement is false.