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 (Sec figure), and these are equally likely outcomes. What is the probability that it will point at
a number less than 9?
⇒ total numbers = 8
⇒ total numbers which are less than 9 = (1,2,3,4,5,6,7,8)
i.e. all 8 numbers are less than 9.
∴ P(Numbers less than 9) = 
⇒ P(Numbers less than 9) = 
⇒ P(Numbers less than 9) = 1.
∴ Probability of arrow will point number less than 9 is 1
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