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Out of 20 consecutive positive integers, two are chosen at random. The probability that their sum is odd is
You have to choose Odd-Even or Even-Odd.
The probabilities of both events are the same: at the start there’s the same amount of odds and evens.
So calculate for one of them and multiply by 22.
First number being odd: 10/20 = 1/2
Second number being even: 10/19
Overall = 10/19*2 *2 = 10/19
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