5) एका पिशवीत आठ लाल व काही निळे चेंडू आहेत. एक चेंडू यादृच्छिक पद्धतीने काढला, तर लाल चेंडू
आणि निळा चेंडू यांच्या संभाव्यतेचे गुणोत्तर 2:5 आहे, तर निळ्या चेंडूची संभाव्यता काढा.
Answers
Answer:
2:5 =8लाल,24निळे चेंडू आहेत
Given : A bag contains 8 red balls and some blue balls.
If one ball is drawn randomly the probability of drawing a red ball to a blue ball are in the ratio 2 : 5
To Find : probability of drawing a blue ball from the bag
Solution:
probability of drawing a red ball to a blue ball are in the ratio 2: 5
probability of drawing red ball = 2P
probability of drawing Blue ball =5P
Total Probability = 5P + 2P = 7P
probability of drawing a blue ball from the bag = 5P/7P =5/7
additional info
To find number of blue balls in Bags
Let say blue balls = B
Total Balls = 8 + B
B /(8 + B) = 5/7
=> 7B = 40 + 5B
=> 2B = 40
=> B = 20
Blue balls = 20
Total Balls = 28
Probability blue balls = 20/28 = 5/7
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