Find sum of the smallest and the largest positive numbers of 6 digits which contains only digits 0, 4, 6 and each of these digits appears at least once:

Correct option is A

Given condition:

Each of 0, 4, 6 digits appears at least once

Solution:

Largest positive numbers of 6 digits which contains only digits 0, 4, 6 =666640

Smallest positive numbers of 6 digits which contains only digits 0, 4, 6 = 400006

Sum of largest and smallest 6 digit number = 666640+400006=1066646