Question

A box contains cards numbered from 1 to 20. A card is drawn at random from

the box. Find the probability that the number on the drawn card is

i) a prime number

ii) a composite number

iii) a number divisible by 3.

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Answer 1

Answer:

Step-by-step explanation:

Hey mate!

A box contains number 1 to 20

So, Total number of outcomes = 20

Now, we need to find the probability :

1. A prime number

The prime numbers from 1 to 20 are : 2, 3, 5, 7, 11 , 13, 17, 19

No. of prime numbers = 8

So, Probability = 8/20

2. A composite number :

No. of composite numbers from 1 to 20 are : 11

So, Probability = 11/20

3. A number divisible by 3

numbers which are divisible by 3 : 3 , 6 , 9, 12, 15, 18

No. of numbers which are divisible by 3 from 1 to 20 = 6

So, Probability = 6/20

Hope it helps :)

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