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

From Rosetta Code
Revision as of 23:27, 8 July 2021 by rosettacode>Gerard Schildberger (added a new talk section concerning the wording of the task's title and the task's requirements.)

number of ways to place two ones in three slots

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)


suggest a task rename

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)

Retrieved from "https://rosettacode.org/wiki/Talk:Positive_decimal_integers_with_the_digit_1_occurring_exactly_twice?oldid=313541"