- #1
pavel329
- 6
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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.
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.
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