medium · GMAT Quant
A cybersecurity firm tests three independent firewalls. The probability that a specific type of attack bypasses Firewall A is 0.2, Firewall B is 0.25, and Firewall C is 0.4.
What is the probability that the attack is blocked by at least one of the firewalls?
- 0.952
- 0.980
- 0.020
- 0.850
- 0.600
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