Question No 9:
Three people are carrying out independent functions during an internal audit. It is known that in each of the three separate areas being investigated there is a serious error.
From past experience, it is estimated that the (independent) chances of the individuals finding the serious error in their area are 0∙8, 0∙7 and 0∙6.
The probability that at least one of the serious errors will be found is
A. (0∙8 x 0∙3 x 0∙4) + (0∙2 x 0∙7 x 0∙4) + (0∙2 x 0∙3 x 0∙6)
B. 1 – (0∙2 x 0∙3 x 0∙4)
C. 1 – (0∙8 x 0∙7 x 0∙6)
D. none of the above.
Answer: B
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