plz solve the ¡¡) question...
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ziyapatel15:
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Answer:
8
Step-by-step explanation:
18 balls are there,
x are red .
18 - x are not red .
(i)
P ( not red ) = ( 18 - x ) / 18
ANSWER :
( 18 - x ) / 18
(ii)
2 more red balls are put .
Total balls = 18 + 2 = 20
Red balls = 2 + x
P = 9/8 ( x )/18
= ( x )/16
Probability = ( 2 + x )/20
So :
( 2 + x ) / 20 = x / 16
= 16 ( 2 + x ) = 20 x
= 4 ( 2 + x ) = 5 x
= 8 + 4 x = 5 x
= x = 8
The number of balls is 8 .
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