there are12 identical balls of different colours in a bag .If 6 more balls of black colour are added the probability of drawing black balls became 1/12.Find no. of black balls
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there are12 identical balls of different colours in a bag .If 6 more balls of black colour are added the probability of drawing black balls became 1/12.Find no. of black balls
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Answer:
3 is the answer.
Step-by-step explanation:
Initially, total number of balls =12
No. of black balls =x
So, P(black ball) =12x
If 6 more black balls are added, total number of balls =12+6=18
NO. of black balls =x+6
P(black ball) = 18x+6
Given the probability of drawing a black ball is now double of what it was before
So, 122x=18(x+6)
6x=18(x+6)
3x=x+62x=6x=3