: 1 - [(1 - a) * (1 - b)]
(1) 1 - [(1 - 60%) * ( 1 - 70%)] = 1 - 30% * 40% = 88%
(2) 1 - [(1- 50%) * (1 -100%)] = 1 - 50% * 0 = 100%
: 1 - [(1 - a) * (1 - b)]
(1) 1 - [(1 - 60%) * ( 1 - 70%)] = 1 - 30% * 40% = 88%
(2) 1 - [(1- 50%) * (1 -100%)] = 1 - 50% * 0 = 100%
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