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25 balls in a box. colors: red, white or blue. each numbered

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25 balls in a box. colors: red, white or blue. each numbered [#permalink] New post 01 Feb 2007, 04:11
25 balls in a box. colors: red, white or blue. each numbered 1 to 10. if 1 is selected at random what is the probability the ball selected is either white
or has even number painted on it?
1. prob. of white and even = 0
2. prob. of white minus prob. even number = 0.2

Answer: E - together insufficient
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Senior Manager
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 [#permalink] New post 01 Feb 2007, 13:36
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I think, we should know the p(even)+p(white)-p(even&white)

since both the statements do not provide the necessary info ans is E
  [#permalink] 01 Feb 2007, 13:36
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25 balls in a box. colors: red, white or blue. each numbered

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