Browse · MATH Print → jmc number theory junior Problem Determine the remainder when 1+12+123+1234+12345+123456+1234567+12345678is divided by 5. Solution — click to reveal If we look at the residues mod 5, we have 1+12+123+1234+12345+123456+1234567+12345678≡1+2+3+4+0+1+2+3≡16≡1(mod5). Final answer 1 ← Previous problem Next problem →