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

(Redirected from Talk:Numbers in which the digit 1 occurs twice)

## 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.

- that

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)