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Question
Find the probability that a number selected from the number 1 to 25 is not a prime number when each of the given numbers is equally likely to be selected.
Solution
Total no. of possible outcomes = 25 {1, 2, 3, … 25}
E โถ event of getting a prime no.
No. of favourable outcomes = 9 {2, 3, 5, 7, 11, 13, 17, 19, 23}
Probability, P(E) =`"No.of favorable outcomes"/"Total no.of possible outcomes"` =9/25
(`barE`) โถ ๐๐ฃ๐๐๐ก ๐๐ ๐๐๐ก ๐๐๐ก๐ก๐๐๐ ๐ ๐๐๐๐๐ ๐๐.
๐(`barE` ) = 1 − ๐(๐ธ)
= 1 − 9/25 =16/25
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(i) 4
