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A computer programm contains one error.in order to find the error, we split the program in to blocks and test 2 of them,selected at random.let X be the numer of errors in these blocks.compute E(x)...
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A computer programm contains one error.in order to find the error, we split the program in to blocks and test 2 of them,selected at random.let X be the numer of errors in these blocks.compute E(x)...

User Pablo Cabrera
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If the E(X) = 1 then that means it has a 100% which is incorrect.
Each block has an equal probability to contain the error so 1/3 because you choose 2/6.
User Jimiclapton
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