Drawing/Picking/Choosing Single/One ball from a bag/urn/box - Probability - Problems Solutions
Total number of balls in the bag
= 5 White + 3 Black
Drawing a ball from a bag containing 5 white and 3 black balls
Total Number of Possible Choices
= Number of ways in which one ball can be drawn from the total 8
A : the event of the ball drawn being black
For Event A
Number of successes for the event of drawing a black ball
⇒ Number of Favorable Choices for event A
= Number of ways in which one black ball can be drawn from the total 3
Number of failures for the event of drawing a black ball
⇒ Number of Unfavorable Choices for event A
= Total Number of possible choices − Number of Favorable choices
|⇒ mAc||=||n − mA|
|=||8 − 3|
- Drawing a ball which is not blue from a box containing 24 balls of the same shape and weight of which 8 are green, 6 are red and the rest are blue.
- Drawing a ball which is neither a black ball nor a green ball from a bag containing 4 green, 5 black, 6 white balls.
- Choosing a ball which is either red or blue from a bag containing 18 white, 16 green, 14 blue and 12 red balls.
- A ball is drawn at random from an urn containing 15 green, 25 black, 16 white balls. . The probability that it is either a black ball or a green ball is
- A box contains 150 bolts of which 50 are defective. Find the probability that the bolt chosen at random from the box is not defective.
- An urn contains 9 red, 7 white and 4 black balls. A ball is drawn at random. What is the probability that the ball drawn will be (i) Red or Black, (ii) White or Black, (iii) Not red, (iv) Neither Red nor Black