Smallest 8-digit number = 1,00,00,000
Largest 5-digit number = 99,999
Largest 7-digit number = 99,99,999
Sum of the smallest 8 digit number, largest 5 digit number and largest 7 digit number = 1,00,00,000 + 99,999 + 99,99,999
= 2,00,99,998
2,00,99,998 = Two crores ninety nine thousand nine hundred and ninety eight