I'm working on modernizing Rosetta Code's infrastructure. Starting with communications. Please accept this time-limited open invite to RC's Slack.. --Michael Mol (talk) 20:59, 30 May 2020 (UTC)

Talk:Positive decimal integers with the digit 1 occurring exactly twice

From Rosetta Code

number of ways to place two ones in three slots[edit]

This is the number of ways to place two ones in three slots, which is three, times the number of ways to place 0,2-9 in the remaining slot, which is nine. So at least twenty seven is the correct answer. Surely somewhere this task is already covered.--Nigel Galloway (talk) 17:00, 8 July 2021 (UTC)

This task can have my vote for deletion as well. --Pete Lomax (talk) 03:58, 9 July 2021 (UTC)
It is a variant of the task Permutations_with_some_identical_elements.--Nigel Galloway (talk) 15:57, 10 July 2021 (UTC)

suggest a task rename[edit]

I suggest that this (draft) task be renamed to reflect:

  •   that   positive integers   be specified instead of   numbers.
  •   that the   number   one be found in the number be changed to the   digit   one   be found in ...
  •   indicate that the integers be expressed in base ten.
  •   specify that   exactly   two   one   digits be found.


The number   1211   does have two   1   digits in it.   It also has a   1   digit in it.

I've already modified the (draft) task's requirements   (as everyone appears to have already assumed positive base ten numbers).     -- Gerard Schildberger (talk) 23:27, 8 July 2021 (UTC)