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Question

A box has 20 balls of which x are red When 4 more red balls are added and then a ball is picked up the probability is 1/2 The value of x is
  1. 4
  2. 6
  3. 8
  4. 10

A
4
B
10
C
8
D
6
Solution
Verified by Toppr

The correct option is B 6
P(red ball)=x+420=12
or x=6

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