Hello to all,
New to the forum.
I have a question you might be able to answer.
You have a box with 9999 notes with a single four digit number written on them.
You have two favourite numbers, e.g. Number 1 and number 7.
You pick one note from the box.
What is the probability that from the 4 digits of the note, 3 of them are always
a combination of your favourite numbers?
For example 1118, 1716, 7771, 1131, 7277, 1717, 7777, 1111 etc.