10 years each year no emergency

for each year of no emergency the prob. is 1-0.15.

for all years no emergency, the prob. is (1-0.15)^10.

That this does not happen, i.e. at least one emergency occurs in 10 years has the prob. of 1-(1-0.15)^10.

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• I see. Good explanations. -yardworker- ♀ (60 bytes) () 09/02/2024 postreply 08:26:54