Question

What is the probability of getting a composite number in 1 to 20

Answer 1

S=(1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20)

n (S)=20

Let A be the event of getting a composite number in 1 to 20

A=(4,6,8,9,10,12,14,15,16,18,20)

n (A)=11

P(A)=n (A)/n (S)

=11/20

Answer 2

Answer: 11/12

Step-by-step explanation:

Total no. of numbers in the given range = 20

Total no. of composite numbers between the range = 11

(Composite numbers are: 4,6,8,9,10,12,14,15,16,18,20)

∴ P (getting  a composite number in 1-20) = 11/20