If N = 1 + 11 + 111 + 1111 + ... +111111111, then what is the sum of the digit's of N?

If N = 1 + 11 + 111 + 1111 + ... +111111111, then what is the sum of t

1.	If N = 1 + 11 + 111 + 1111 + ... +111111111, then what is the sum of the digit's of N?
A.	45
B.	18
C.	36
D.	5
Answer» B. 18