Best Answer

One in four.

The possibilities are;

Red Red

Blue Red

Red Blue

Blue Blue

That means the number of ways an event can occur is one, while the number of possible outcomes is four. The definition of probability is the number of ways the event can occur over the number of possible outcomes, hence 1/4

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Q: If a box contains one red ball and one blue ball and two people touch one ball randomly with a one in two chance of picking either what is the chance of the blue ball being picked twice?
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