The solution would be
like this for this specific problem:
[tex]( \frac{30}{46}) * ( \frac{29}{45}) * ( \frac{28}{44}) *( \frac{27}{43}) = 0.168[/tex]
The probability that
at least one of the 4 calculators in the sample is defective is complement of
0.168 so the answer is 0.832.
