A bag contains \[5\]white and \[8\]red balls. Two successive drawings of \[3\] balls are made such that the balls are not replaced before the second draw. Find the probability that the first drawing will give \[3\]white and the second \[3\]red balls.
Answer
620.7k+ views
Hint: In the given problem we have to use the concept of probability. We have to find the probability that the first drawing will give 3 white and the second 3 red balls. First, we have to find the probability that the first three balls are white in the first draw, with no replacement and then we have to find the second draw, the probability that all are red. Then we have to multiply these two results.
Complete step by step answer:
A bag contains \[5\] white and \[8\] red balls.
Total number of balls =\[13\].
Two successive drawings of 3 balls are made such that the balls are not replaced before the second draw.
We have to find the probability that the first drawing will give \[3\]white and the second \[3\]red balls.
The probability of first three balls is white in first draw, with no replacement is
\[\Rightarrow \dfrac{5}{13}\times \dfrac{4}{12}\times \dfrac{3}{11}=\dfrac{60}{1716}\]
Now the second draw, the probability that all are red is
\[\Rightarrow \dfrac{8}{10}\times \dfrac{7}{9}\times \dfrac{6}{8}=\dfrac{336}{720}\]
Thus, the probability that the first drawing will give \[3\] white and the second \[3\] red balls is
\[\Rightarrow \dfrac{60}{1716}\times \dfrac{336}{720}=\dfrac{7}{429}\]
Therefore, the probability that the first drawing will give \[3\] white and the second \[3\]red balls is \[\dfrac{7}{429}\]
Note: Students should be well aware of the basic formulae of probability. Students should be very careful while doing the calculation part for the given question. Students should have to understand the question properly. Students should have to read questions thoroughly. We should not miss any probability example in this question in second draw the probability that all are red is \[\Rightarrow \dfrac{8}{10}\times \dfrac{7}{9}\times \dfrac{6}{8}=\dfrac{336}{720}\] and not \[\Rightarrow \dfrac{8}{10}\times \dfrac{7}{9}\] .
Complete step by step answer:
A bag contains \[5\] white and \[8\] red balls.
Total number of balls =\[13\].
Two successive drawings of 3 balls are made such that the balls are not replaced before the second draw.
We have to find the probability that the first drawing will give \[3\]white and the second \[3\]red balls.
The probability of first three balls is white in first draw, with no replacement is
\[\Rightarrow \dfrac{5}{13}\times \dfrac{4}{12}\times \dfrac{3}{11}=\dfrac{60}{1716}\]
Now the second draw, the probability that all are red is
\[\Rightarrow \dfrac{8}{10}\times \dfrac{7}{9}\times \dfrac{6}{8}=\dfrac{336}{720}\]
Thus, the probability that the first drawing will give \[3\] white and the second \[3\] red balls is
\[\Rightarrow \dfrac{60}{1716}\times \dfrac{336}{720}=\dfrac{7}{429}\]
Therefore, the probability that the first drawing will give \[3\] white and the second \[3\]red balls is \[\dfrac{7}{429}\]
Note: Students should be well aware of the basic formulae of probability. Students should be very careful while doing the calculation part for the given question. Students should have to understand the question properly. Students should have to read questions thoroughly. We should not miss any probability example in this question in second draw the probability that all are red is \[\Rightarrow \dfrac{8}{10}\times \dfrac{7}{9}\times \dfrac{6}{8}=\dfrac{336}{720}\] and not \[\Rightarrow \dfrac{8}{10}\times \dfrac{7}{9}\] .
Recently Updated Pages
Write any three differences between metals and nonmetals class 10 social science CBSE

Amit standing on a horizontal plane finds a bird flying class 10 maths CBSE

Two circles of radii 5 cm and 3 cm intersect at two class 10 maths CBSE

Solve the following i John and Jivanti together have class 10 maths CBSE

What is the relation between orthocenter circumcentre class 10 maths CBSE

Two plane mirrors are inclined at 70circ A ray incident class 10 physics CBSE

Trending doubts
Explain the Treaty of Vienna of 1815 class 10 social science CBSE

Which country is known as "The land of Fire and Ice"?

1 GB equals how many MB?

10 examples of evaporation in daily life with explanations

What is the full form of POSCO class 10 social science CBSE

Which is the hottest planet in the Solar system A Earth class 10 social science CBSE

