Question

A box contains cards numbered 1to 15. One card is drawn at random. Find the[2]probability that the card contains a numberwhich is:a)A factor of 12.b) A prime number

Answer 1

Step-by-step explanation:

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