In a ballot box there are 10 red, 18 blue and 12 green spheres. To find the probability that the taken-out sphere will not be green.

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In total It is necessary to find the probability that the taken-out sphere will not be green in a ballot box of 10+18+12=40 spheres, i.e. it is possible to pull out any red and any blue sphere the Sum red and blue: 10+18=28 our probability are 28/40= 0.7
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