PDF chapter test TRY NOW

1. A game of chance consists of spinning an arrow which is equally likely to come to rest pointing to one of the numbers \(1\), \(2\), \(3\), …\(12\).
 
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What is the probability that it will point to:
 
i) Number 7 \(=\) ii
 
ii) A prime number \(=\) ii
 
iii) A composite number \(=\) ii
 
2. A bag contains \(6\) green balls, some black and red balls. Number of black balls is as twice as the number of red balls. Probability of getting a green ball is thrice the probability of getting a red ball. Find (i) number of black balls (ii) total number of balls.
 
Answer:
 
The number of black balls \(=\)
 
The total number of balls \(=\)
 
[Note: Enter numerator and denominator in simplified form.]