What is the probability that the third failure will occur

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An electronic circuit board with lambda(t) = 0.00021 h^-1 is replaced on failure. What is the probability that the third failure will occur by 10000h? ( hint: if there were 4 0r more failures by 10000h, that also means there were 3 failures by 10000h!)

Reference no: EM13273841

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