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plz solve the second part step be step
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plzzzz help me with this question
will mark as brainliest
plz solve the second part step be step
quality answer needed!!!!!!
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Answer:
8
Step-by-step explanation:
Total No . of Obs = 18
No . of Red Balls = x
Probability of Red Ball = Favourable Obs / Total No. of Obs
P(of Red Ball) = x/18
Two Red Balls Are Added
So,
No . of Red Balls = x + 2
Total no .of Balls = 18 + 2 = 20
P(of red Ball) = x + 2 / 20
P given 9 times of P obtained in A
9/8 * x/18 = (x + 2)/20
x / 16 = (x + 2)/20
(x / 16) * 20 = x + 2
5x / 4 = x + 2
5x = 4x + 8
5x - 4x = 8
x = 8
Therefore,
Initial No.Of Red Balls = 8
Hope U Understood
Mark This Brainliest If This Helped You
I) no. of red ball = x
total balls = 18
non red = 18-x
thus probability to get non red = 18-x/18
2) now after adding 2 balls total red balls = x+2
probability of drawing red ball in first case
= x/18
probability of getting red ball after adding 2 more balls = x+2/20
here 20 since after adding 2 balls total ball = 18+2 = 20
given condition
(x+2)/20. = 9x/8*18
= > 4x+8 = 5x
x = 8