Answer:
The fractional probability of getting 2 heads is 1/4.
 
        
             
        
        
        
Answer:
Step-by-step explanation:
We are to show that 
<u>Proof:</u>
From trigonometry identity;


From trigonometry, 2sinAcosA = Sin2A

Also note that sin(B-C) = sinBcosC - cosBsinC
sin420cos140 - cos420sin140 = sin(420-140)
 The resulting equation becomes;

= 
 
        
             
        
        
        
The answer is : 1:6 repeating
        
             
        
        
        
60% = 0.6
12 / 0.6 = 20
answer 12 is 60% of 20
        
             
        
        
        
E=8.75*n ............................................................................................................................................