document.write( "Question 637653: From a lot of 12 missiles, 5 are selected at random and fired. If the lot contains 3 defective missiles that will not fire, what is the probability that
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Algebra.Com's Answer #401791 by ewatrrr(24785) $\"\"$ $\"About$

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document.write( "Hi,
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document.write( "From a lot of 12 missiles, 5 are selected at random and fired. 
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document.write( "If the lot contains 3 defective missiles th are defective
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document.write( "P(5 will fire) = (3/4)^5
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document.write( "P(at most 2 will fire) = P(0 fire) + P(1 fire) + P(2 fire)
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document.write( "                       = (1/4)^5 + 5(1/4)^4(3/4)^1 + 10(1/4)^3(3/4)^2\r
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document.write( "Note: The probability of x successes in n trials is: 
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document.write( "P = nCx*  where p and q are the probabilities of success and failure respectively. 
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document.write( "In this case p = 3/4 & q = 1/4
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document.write( "nCx = 
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