allearea1501 allearea1501

29-06-2017
Mathematics

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A box contains 11 transistors, 5 of which are defective. If 5 where selected random find the probility of the none defective ones?

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konrad509 konrad509

29-06-2017

[tex]|\Omega|=C(11,5)=\dfrac{11!}{5!6!}=\dfrac{7\cdot8\cdot9\cdot10\cdot11}{2\cdot3\cdot4\cdot5}=462\\ |A|=C(6,5)=6\\\\ P(A)=\dfrac{6}{462}=\dfrac{1}{77}[/tex]

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