If 1+12+123+1234+12345+123456+1234567+12345678 is congruent to n modulo 9, where $0\le n<9$, what is the value of n?
(1 + 12 + 123 + 1234 + 12345 + 123456 + 1234567 + 12345678) mod 9 = 3
n = 3
incorrect... sorry... but thanks!
