Back to the dice---the friend peeked and said one is a 3. What are the odds the other is a 5? Still 1 of 6.
. The answer to that one is 1/6
That's a different question - one that assumes the peeker will announce the value of a random die even if there is no 2 under the cup. The answer to that one is 1/6.
This is not the question asked here though.