Question
A box contains balls out of which are black. If one ball is drawn at random from the box, what is the probability that it will be a black ball?
If more black balls are put in the box, the probability of drawing a black ball is now double of what it was before. Find .
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Text solutionVerified
Initially, total number of balls
No. of black balls
So, P(black ball)
If 6 more black balls are added, total number of balls
NO. of black balls
P(black ball) =
Given the probability of drawing a black ball is now double of what it was before
So,
So, the number of black balls present initially
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Question Text | A box contains balls out of which are black. If one ball is drawn at random from the box, what is the probability that it will be a black ball? If more black balls are put in the box, the probability of drawing a black ball is now double of what it was before. Find . |
Answer Type | Text solution:1 |
Upvotes | 150 |