Re: hot to write out this summation:

On 6/30/24 8:36 PM, Barry Schwarz wrote:

On 30/06/2024 22:38, Chris M. Thomasson wrote:

r[0] = .01
r[1] = .0011
r[2] = .000111
r[3] = .00001111
r[4] = .0000011111
...
>
Now, think of a possible formula.

 If you start numbering at 1 instead of 0, then
 r[n] = int(10^n / 9) / 10^(2n)
 where int denotes the integer portion of the value.
 

And you can get rid of the 'int' function by using:
r[n] = ((((10^n)-1)/9) / 10^(2n)
or
r[n] = ((10^n)-1)/(9*(10^(2n)))