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.
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)