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A bag contains 18 balls out …

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A bag contains 18 balls out of which x balls are red. i) If one ball is drawn at random from the bag, what is the probability that it is not red? ii) If two more balls are put in the bag, the probability of of drawing a red ball will be 9/8 times the probability of drawing a red ball in the first case. Find the value of x.

Posted by Harsha Rajesh 5 years, 11 months ago

CBSE > Class 10 > Mathematics

4 answers

Ajay ???? 5 years, 11 months ago

Let the red balls be x Probability of not red is 18-x/18 ii) x/20= 9×(18-x)/8×18 x/20=162-9x/144 144x=20(162-9x) 144x=3240-180x 144x+180x=3240 324x=3240 x=10

Ashwani Yadav 5 years, 11 months ago

If i consider 2 balls are red then x = 8

Ashwani Yadav 5 years, 11 months ago

Your question is not clear. Because u have not mentioned which 2 balls .

Piyush Kr.?? 5 years, 11 months ago

Since, the value of x comes 10...hence the probability of the ball not to be red is 4/9 in first case.!!!!

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