Question

A bag contains white black and red balls only a ball is drawn at random from the bag. if the probability of white ball os 3/10 and that of black ball is 2/5 then fond probability of red balls.if bag contains 20black ball's then find total number of balls in bag

Answer 1

No of red balls is 3/10 and if there will be 20 black balls so the bag contains 30 balls

Answer 2

P(of red ball)= 1-(3/10+2/5)

= 1-(3+4/10)

= 1-7/10

= 10-7/10

P(of red ball)=3/10

No of black balls=> 20/total no.of balls=2/5

=>50=Total no.of balls

No.of red balls=>

3/10=No.of red balls/50

15=No.of red balls

No.of white balls=>

3/10=No.of white balls/50

15=No.of white balls

Hope it helped..

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