SOLUTION: 1,12,123,1234,.........n what is the nth term?

Algebra ->  Sequences-and-series -> SOLUTION: 1,12,123,1234,.........n what is the nth term?       Log On


   

Question 253752: 1,12,123,1234,.........n
what is the nth term?
Answer by Edwin McCravy(20056) About Me  (Show Source):
You can put this solution on YOUR website!
1+=+1%2A1+=1%2A10%5E0=1%2A10%5E%281-1%29+=+sum%28k%2A10%5E%281-k%29%2C+k=1%2C+1%29



...
So the nth term = sum%28k%2A10%5E%28n-k%29%2C+k=1%2C+n%29
`
Edwin