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Mathematics, 02.02.2020 12:40 MZ2017

Agroup of 40 trees in a forest are not growing properly. a botanist determines that 34 of the trees have a disease or are being damaged by insects, with 18 trees having a disease and 20 being damaged by insects. what is the probability that a randomly selected tree has both a disease and is being damaged by insects? explain so i can know how to do a similar question like this in the future

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