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Bayes' Theorem

A ball contai...

Question

A ball contains x white, y red, z blue balls. A ball is drawn at the random then, what is the probability of drawing blue ball.

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Solution

Total number of balls $= x + y + z$
Number of blue ball $= z$
$∴$ Probability of drawing a blue ball $= \frac{z}{x + y + z}$

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