Teaching DSSSB TGT Mock Test 2025 Engineering Mathematics Probability Conditional Probability

For two events A and B, which of the following relations is true?

1
\(P(\bar A \cup \bar B) = 1 - P(A)P\left(\frac B A\right)\)
2
P(A̅ ∪ B̅) = 1 - P(A ∪ B)
3
\(P(\bar A \cup \bar B) = P(\overline {A\cup B})\)
4
P(A̅ ∪ B̅) = P(A̅) + P(B̅)
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