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  • 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

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

 

 
 
 
 
 

Answers (1)

Total out comes = 20 

1) prime number between 1 to 20 are 2,3,5,7,11,13,17,19, i.e 8 

P ( drawing a prime number ) = 8/20 = 2/5 

2) a composite number between 1 to 20 are 4,6,8,9,10,12,14,,15,16,18,20, ie . 11

P (drawing a composite number ) = 11/20

3) A number divisible by 3 arwe 3,6,9,12,15,18, i.e 6 

P (drawing a number divisible by 3 ) = 6 /20 = 3/10 

 

Posted by

Safeer PP

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