Babyjanecajes09viz
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from 1 to 20 your sister chooses a number at random. what is the probability that the number chosen is not odd?
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Avillaluzviz

There are 10 even numbers (count 2, 4, 6, 8... 20; or via shortcut, 20 divided by 2)

There are 20 numbers in total from 1 to 20.

So the probability is 10 / 20, or 1/2.