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Question
There are 25 discs numbered 1 to 25. They are put in a closed box anx shaken thoroughly. A disc is drawn at random from the box.
Find the probability that the number on the disc is :
(i) an odd number
(ii) divisible by 2 and 3 both.
(iii) a number less than 16.
Solution
(i) an odd number = {1,3,5,7,9,11,13,15,17,19,21,23,25}
∴ Probability of an odd number =`13/25`
(ii) Divisible by 2 and 3 both = { 6,12,18,24 }
Probability of the number divisible by 2 and 3 both = `4/25`
(iii) Probability a number less than 16 `=15/25 = 3/5`
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