<PRE><B>Question 127279</B>
A certain airplane has two independent alternators to provide electrical power. The probability that a given alternator will fail on a 1-hour flight is .02. What is the probability that (a) both will fail? (b) Neither will fail? (c) One or the other will fail? 
Prob(both fail) =0.2*0.2 = 0.04
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Prob(neither will fail) = 0.8*0.8 = 0.64
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Prob(one will fail) = 1-P(none will fail)-Prob(both will fail) = 1-0.68
= 0/32
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Cheers,
Stan H.</PRE>