Question

this question is based on probablity.
Plz help me quickly. ​

Answer 1

Answer:

1)

prob. of ball not being red= (18-x)/18

2)now,

total number of balls =20

number of red balls = x+2

according to sum

(x+2)/20=(9/8)×x/18

            or

(x+2)/20=9x/144

            on simplification

144x+288=180x

or

36x=288

or x=8

therefore there were 8 red balls originally

Step-by-step explanation:

Answer 2

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