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A bag contains 12 balls out of which are black balls. Find the probability of getting a
Hack ball if one ball is drawn. If 6 more blacks balls are added in the bag, the probability
of setting a black ball will be double. Find
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Answer:
black balls =x
no of balls =12
probability =y
y=x/12...... 1
when 6 balls added
no of balls= 12+6
no of black balls =x+6
probability =2y.
2y=x+6/18
from 1
2×x/12=x+6/18
x/6=x+6/18
x=x+6/3. (MULIPLY BY 6)
3x=x+6
3x-x=6
2x=6
x=3
no of black balls =3
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