Correct Answer:
Option D - According to question,
Greatest number of six-digit = 999999
Smallest number of six-digit = 100000
Hence required sum = 999999 + 100000
= 1099999
D. According to question,
Greatest number of six-digit = 999999
Smallest number of six-digit = 100000
Hence required sum = 999999 + 100000
= 1099999