Page 409 - Offshore Electrical Engineering Manual
P. 409
396 CHAPTER 1 Reliability
FIGURE 8.1.5
(A) AND and (B) OR logic for fault tree evaluation.
If the probabilities P(a) and P(b) are each 0.1 or less, then the product P(a) · P(b)
is very small compared with the sum P(a) + P(b) and a good approximation may be
obtained from
P (a + b) = P (a) + P (b)
