### Question 55

Two independent test groups, A and B, tested a system in parallel for a given period of time, and each group detected N_{A} and N_{B} of errors, respectively. Of these, N_{AB} is the number of common errors. Assume that the error detection capability and efficiency of group A are equal to those of group B. Which formula is used to predict the total number of errors in this system?

In this problem, assume N_{A} > 0, N_{B} > 0 and N_{AB} > 0

a) N ＝ NA ＋ NB － NAB

b) N ＝ NAB × NA × NB

c) N ＝ ( NA ＋ NB )／ NAB

d) N ＝ ( NA × NB )／ NAB

answer

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