Question

The largest $4$-digit and smallest $4$-digit numbers formed by using the digits $4,0,3,7$ each only once respectively are______.

• A. $4370,4307$
• B. $3740,3047$
• C. $7403,3704$
• D. $7430,3047$

Answer 1

The correct option is D $7430,3047$

To form the largest number we must arrange in descending order:

So, largest four digit number formed by the digits $4,0,3,7=7430$

To form smallest digit number by the digits, we must arrange in ascending order by keeping '$0$' in the second place from left side:

So, smallest four digit number by the digits $4,0,3,7=3047$.