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The condition was written so inaccurately that clearly showed that the person who wrote it did not understand the meaning of what he wrote.
The correct formulation is T H I S:
Urn 1 has 2 white and 3 black balls; Urn 2 has 4 white and 1 black; Urn 3 has 3 white and 4 black.
A ball was selected to be white. Find the probability that the ball was selected from Urn 1.
Solution
In all, there are 2 + 4 + 3 = 9 white balls.
Therefore, the answer/(the probability under the question) is 
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Solved.
