A bag has 4 red balls and x blue balls if a ball is drawn from the bag without looking into it and the probability of getting a blue ball is 1/2,then the value of x is :
A) 2
B) 4
C) 8
D) 12
Answers
Answered by
2
the answer might be 2. sorry if it is wrong
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9
Option (B) - 4.
Given, No of red balls = 4
No of blue balls = x -------------- (1)
Total number of balls = x + 4 -------------- (2)
Given, p(blue ball) = 1/2 -------------- (3)
On solving (1),(2),(3), we get
1/2 = x/(x+4)
x+4/2 = x
x+4=2x
x = 4.
Hope this helps!
Given, No of red balls = 4
No of blue balls = x -------------- (1)
Total number of balls = x + 4 -------------- (2)
Given, p(blue ball) = 1/2 -------------- (3)
On solving (1),(2),(3), we get
1/2 = x/(x+4)
x+4/2 = x
x+4=2x
x = 4.
Hope this helps!
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