Question:

Two events $A$ and $B$ will be independent if

Updated On: Aug 1, 2022
  • A and B are mutually exclusive
  • $P(A' \cap B') = (1 - P (A)) (1-P(B))$
  • $P (A) = P(B) $
  • $ P (A) + P(B) = 1 $
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The Correct Option is B

Solution and Explanation

If $A$ and $B$ are two independent events, then $P(A \cap B)=P(A) \cdot P(B)$ Also, if $A$ and $B$ are independent then A' and B' are also independent. $ \therefore P\left(A' \cap B'\right) =P\left(A'\right) \cdot P\left(B'\right)$ $=(1-P(A))(1-P(B)) $ Again, if $A$ and $B$ are mutually exclusive, then $P(A \cap B)=0$
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Concepts Used:

Venn Diagrams

A Venn diagram can be described as a diagram that is used to represent all possible relations of distinct sets. It can be shown by any closed figure whether by a circle or a polygon. In general, circles are used to represent each set.

U reflects the universal set as a closed rectangle comprised of all the sets. The sets and subsets are shown by making use of circles or oval shapes.

Venn Diagram Symbols:

The symbols used while depicting the operations of sets are:

  • Union of sets symbol: ∪
  • The intersection of sets symbol: ∩
  • Complement of set: A’ or Ac
Venn diagram