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12 balls are in a box. 5 among them are ...

12 balls are in a box. 5 among them are blue and others are black. Without loọking into the box, one ball is taken
a) Find the probability of getting a blue ball?
b) After putting one blue ball and one black ball into the basket, a ball is taken. Is the probability of getting a blue ball increases or decreases? Justify your answer.

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