Question:
Which of the following cannot be the probability of an event?
(a) $\frac{2}{3}$
(b) $-1.5$
(c) $15 \%$
(d) $0.7$
Solution:
GIVEN: 4 options of probability of some events
TO FIND: Which of the given options cannot be the probability of an event?
We know that
.
As the probability of an event cannot be negative
In option (b) P=-1.5
Hence the correct answer is option 
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