Hello, Iconoclast!

A box contains four stones: one white, one yellow, and two blue.

I put my hand into the box and pick up two stones.

I bring my hand out in a fist, look inside my fist and remove a blue stone.

What is the probability that the other stone in my hand is also blue?

The problem is small enough to LIST all the outcomes.

The four stones are:.

There are six possible outcomes:

. .

We are told that one of the two stones is blue.

The sample space is reduced tooutcomes:five

. .

The stones are both blue in exactlycase.one

Therefore: .