Using digits 4, 0, 9, 8 form the largest and smallest number of four digits. Repetition is not allowed. Sum of these two numbers is

Correct option is B

Given:

Digits = 4, 0, 9, 8

Form the largest and smallest four-digit numbers

Repetition not allowed

Find their sum

Solution:

Largest → just sort digits ↓ → 9840

Smallest → keep 0 second, smallest non-zero first → 4089

Sum = 9840 + 4089 = 13929