a bag contains 36 balls out of which x are black. if 12 more black balls are put in the bag, the probability of drawing black ball is 0.5. find the value of x.
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total number of outcomes =36
number of favourable outcomes = x
P(E) = number of favourable outcomes/total number of outcomes
So, P(getting black balls) = x+12/36
or 5/10=x+(1 /3)
or 1/2-1/3=x
or (3-2)/3=x
or x= 1/3
the answer is 1/3
number of favourable outcomes = x
P(E) = number of favourable outcomes/total number of outcomes
So, P(getting black balls) = x+12/36
or 5/10=x+(1 /3)
or 1/2-1/3=x
or (3-2)/3=x
or x= 1/3
the answer is 1/3
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