Part of an electrical circuit consists of three elements K, L and M in series. Probabilities of

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Part of an electrical circuit consists of three elements K, L and M in series. Probabilities of failure for elements K and M during operating time t are 0.1 and 0.2 respectively. Element L itself consists of three sub-elements L1, L2 and L3 in parallel, with failure probabilities 0.4, 0.7 and 0.5 respectively, during the same operating time t. Find the probability of failure of the circuit during time t, assuming that all failures of elements are independent.

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