Tip:A–D to answerE for explanationV for videoS to reveal answer
Suppose that A and B are two events with probabilities P(A)=21,P(B)=31, then, which of the following is true?
- A.
31≤P(A∩B)≤21
- B.
41≤P(A∩B)≤31
- C.
61≤P(A∩B)≤31
(Correct Answer) - D.
41≤P(A∩B)≤21
Correct Answer: 61≤P(A∩B)≤31
Explanation
Maximum Value:
P(A∩B)≤min(P(A),P(B))
P(A∩B)≤min(21,31)
P(A∩B)≤31
Minimum Value (Standard Reference):
For independent events:
P(A∩B)=P(A)⋅P(B)
P(A∩B)=21⋅31=61
Range:
61≤P(A∩B)≤31
Correct Option: (c)
Explanation
Maximum Value:
P(A∩B)≤min(P(A),P(B))
P(A∩B)≤min(21,31)
P(A∩B)≤31
Minimum Value (Standard Reference):
For independent events:
P(A∩B)=P(A)⋅P(B)
P(A∩B)=21⋅31=61
Range:
61≤P(A∩B)≤31
Correct Option: (c)