Question

A bag contains 12 balls out of which x are white
a 》 If 1 ball is drawn at random what is the probabality that it will be white ball
b》If 6 more white balls are put in the bag the prob. of drawing a white ball be double than that in case a . Find x

Answer 1

a) Given that the number of white balls are in the bag is x
then the probability of drawn the ball which is white = xC1/12c1
=x/12
b) according to the question x+6=2x
then x=3
and then the probability of the drawn the white ball =3/12=1/4
I hope this may be helpful.