Question

A game of chance consists of spinning an arrow which comes to rest pointing at one of the numbers 1, 2, 3, 4, 5, 6, 7, 8 (see the Figure) and these are equally likely outcomes.

What is the probability that it will point at 

(i) 8? 

(ii) an odd number 

(iii) a number greater than 2 ? 

(iv) a number less than 9 ?

Answer 1

Total numbers in the spinning = 8 

∴ n(A) = 1 

(i) Possibility that points one number is 8 : n(A) = 1

(ii) Possibility that points one odd number : 1, 3, 5, 7 

∴ n(B) = 4

(iii) A number greater than 

2 : 3, 4, 5, 6, 7, 8 

∴ n(C) = 6