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.

Thank you!

George.