Solution. Using formula for classical probability
where A is event from a bag contains 9 balls numbered 1 to 9 two balls are drawn at random that one is odd and the other is even; f is the frequency, or number of possible times the event could happen; N is the number of times the event could happen.
The number of combinations of the ability to select two balls out of 9 is equal to
From one to nine five odd numbers and four even. Therefore
As result get
Answer.
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