Oracle/SQL - Finding records with one value excluding nulls

I have a question very similar to another question but I can't quite figure it out. Here is the link to the original question:Oracle/SQL - Finding records with one value excluding by similar record

So similar to that problem, I have records that will either have a 1 or null. the same records can be a combination of 1 or null and in those instances, I want to exclude the record altogether. For example:

    Person  Type
    --------------
    Bob     1
    Sue     1
    Bob     null
    Tom     1
    Frank   1
    Frank   null
    Fred    null

I want the following returned:

    Person  Type
    --------------
    Sue     1
    Tom     1

Any direction on this would be very much appreciated. I dont have much time to solve this so even speaking conceptually will help!

The closest I came was

    select person from table
    where type = 'S'
    MINUS
    select person from table
    where type is null

But of course that doesnt work.

I can write a function if that is the only way. Thank you!

Copyright Notice：Content Author:「Ryan Nalls」，Reproduced under the CC 4.0 BY-SA copyright license with a link to the original source and this disclaimer.
Link to original article：https://stackoverflow.com/questions/29180957/oracle-sql-finding-records-with-one-value-excluding-nulls