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0.996
To find the probability that at least two businesses succeed, we can calculate the probability that exactly one business fails and subtract that from 1.
The probability that one business fails is 0.3, and the probability that the other three succeed is 0.7^3 = 0.343. So, the probability that exactly one business fails is 0.3 * 0.343 = 0.1029.
Therefore, the probability that at least two businesses succeed is 1 - 0.1029 = 0.9971.