probability of 5 correct cards out of 6 cards

Hi,

Lately I have been facing quite complex (complex for me) calculation that my client is expecting me to provide the most accurate results.

Basically, my problem is defining probability result for one of the simple computer game I do.

**There are 6 cards with numbers 1 - 6 facing down. Only one card is randomly selected by computer.**

My task is to reveal all the 5 cards but not the one chosen by device.

My question is, what is the probability of choosing correctly 5 cards?

I have been banging my head against the brick wall to get the right results and however I calculate I am really not sure of being correct.

I believe the answer will be very simple.

I would really be grateful for your help.

Thanks a lot and have a good day.