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A box has 10 red balls and 5 black balls. A ball is selected at random from the box. If the ball is red, it is returned to the box. If the ball is black, then 2 additional balls are added to the box. What is the probability that a second ball selected from the box will be red ?

A box has 10 red balls and 5 black balls. A ball is selected at random from the box. If the ball is red, it is returned to the box. If the ball is black, then 2 additional balls are added to the box. What is the probability that a second ball selected from the box will be red ?

Grade:12th pass

1 Answers

wdfghyh
15 Points
5 years ago
The probality of a second ball selected from the box will be red is:
                                10/17
          as they were total 15 balls in the starting.
          we add 2 black balls 
            so the probality will be 10/17
 

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