Question

Please give the solution of the above question.

if u got right I will brainlist it.
NO SPAM!!! ​

Answer 1

refer to the attachment.....

Answer 2

Let probability of black ball, red ball and white ball be P(B), P(R) and P(W) respectively.

According to question,

P(B) + P(R) + P(W) = 1

=> 2/5 + P(R) + 3/10 = 1

=> P(R) = 1 - (2/5 + 3/10)

=> P(R) = 1 - 7/10 = 3/10

Now, P(B) = No. of black balls / Total balls

=> Total balls = No. black balls / P(B)

= 20 / (2/5)

= 50

Therefore, No. of White balls = Total balls x P(W) = 50 x 3/10 = 15 balls

And

No. of Red balls = Total balls x P(R) = 50 x 3/10 = 15 balls

I hope you got your answer please mark me as brilliantiest.

thanks