Question

Find the sum of the digits 10^15−1.

Answer 1

Answer:

149

Step-by-step explanation:

Answer 2

Answer:

135

Step-by-step explanation:

10^15 = 1 000 000 000 000 000

10^15 - 1 = 999 999 999 999 999

There are 15 nines

15*9 = 135