Saved Bookmarks
| 1. |
एक बक्सा जिसमें 5 सफेद तथा 4 काली गेंदे हैं, से 3 गेंदे निकाली जाती है उन तीनों के सफेद होने की क्या संभावना है |
|
Answer» Given: A box contains 5 white balls and 4 black balls To find:The probability of getting 3 white balls in a draw of balls from a box containing 5 white and 4 black balls SOLUTION:No. of white balls in the box = 5 No. of black balls in the box = 4 ∴ Total no. of balls in the box = 5 + 4 = 9 We know that,
We will find the probability of getting 3 white balls in a draw of balls from the box, both with replacement and without replacement : Case (1): When 3 balls are drawn from the box with replacement Therefore, The probability of getting 3 white balls in a draw of balls from a box containing 5 white and 4 black balls is, =
=
Case (2): When 3 balls are drawn from the box without replacement Therefore, The probability of getting 3 white balls in a draw of balls from a box containing 5 white and 4 black balls is, =
=
dividing both the numerator and denominator by 12 we get =
----------------------------------------------------------------------------------------------- Also View:A BAG contains 4 red, 5 white and 2 blue balls. If 2 balls are randomly drawn, find the probability that both are of the same color. A bag contains 4 red, 5 black and 6 white balls. A ball is drawn from the bag at random. Find the probability that the ball drawn is : A box contains 5 white and 7 black balls. two successive drawn of 3 balls are MADE (i) with replacement (ii) without replacement . the probability that the first draw would produce white balls and the second draw would produce black balls are respectively |
|