A mobile number consists of ten digits. The first four digits of the number are 9, 9, 8 and 7. The last three digits are 3, 5 and 5. The remaining digits are distinct and make the mobile number, the greatest possible number. What are these digits?

As the remaining digits lie on the middle. it can start with 0.

total remaining digits are = 10 - (4 + 3)[it’s a 10 - digit number, first four and last three digits are given]

= 3

So, these remaining digits, may start with 0 (not required, as it would not make it max.), are such that, they make the maximum number of 3 digits, so that the actual number is maximum,

= 999

The remaining digits are 9, 9, 9.