1. I don't understand how to prove this. for all n≥1, 10n - 1 is divisible by 9. 3. I've done the basis step. Now i'm on the inductive step. I'm using (10k+1-1)/9=1. I don't know where to go from there. Using algebra just gets me down to 10k+1= 10. And I really don't think that's the answer. All examples i've seen show me things like 1...2..3..n+1= n(n+1) or something along the lines. They already give me the equation. This one does not.