A bag contains 20 balls out of which are X blue balls . Then a ball is chosen randomly so find the probability of getting blue balls. Then 10 blue balls are added to the bag,now find the number of blue balls in the bag.
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Step-by-step explanation:the total number of possible outcome = 7
The total no of favourable outcome = 3
Let the A be the event of getting red ball
P ( A ) be the event of getting red ball = 3/ 7
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