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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.Β
The probabilities of both events are the same: at the start thereβs the same amount of odds and evens.Β
SoΒ calculate for one of them and multiply byΒ 22.
First number being odd:Β 10/20Β =Β 1/2
Second number being even:Β 10/19
Overall = 10/19*2 *2 = 10/19
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