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Sum

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.

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#### 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`

Concept: Random Experiments

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