Question

A bag contains 18 balls out of which Balls are red case(1) if one ball is Random from the bag what is probability not red. case(2)if two more red ball are pat the probability are drawing a red ball will be 9/8 times the probability of drawing a red ball in the first case

Answer 1

Step-by-step explanation:

Probability of finding a red ball in a draw- x/18.

i) Probability of not finding a red ball in a draw is 1 - x/18 = (18 - x)/18

ii) If two red balls are put in, then there is 20 balls, out of which x + 2 are red.

Probability of drawing a red ball- (x+2)/20.

According to the question,

\dfrac{x+2}{20} = \dfrac98 \dfrac{x}{18}

or, \dfrac{x+2}{5} = \dfrac{x}{4}

or, 4x + 8 = 5x

or, -x = - 8

, x = 8

So, the answer is x = 8

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Answer 2

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