CBSEJEEClass 10
Which of the following cannot be the probability of an event?
Answer
Any value less than 0 or greater than 1 (such as −1.5, 7/5 or a percentage above 100%) cannot be the probability of an event, because probability must lie between 0 and 1.
The working
The rule
For any event E, the probability satisfies 0 ≤ P(E) ≤ 1. No probability can be negative or exceed 1.
Check the range
Convert each option to a decimal and see whether it lies within 0 to 1. Values like −0.7 or 1.001 are outside the range.
Common invalid forms
A fraction greater than 1 (like 7/5 = 1.4), a percentage above 100%, or any negative number cannot be a probability.
Example
Among 0.7, 3/7, −1.5 and 0.96, only −1.5 cannot be a probability because it is negative.
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