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f(n) = 3n+3 ;  
f(n) = O(n)   

By definition :

$3n+3 \le c_1.n$   

By dividing both side by n
$3+(3/n) \le c_1$
means we r getting constant range for $c_1$ for any $n$. Again it shows c's value must be greater than 3 at any cost.
e.g. if we take c's value 3.5 so n's value will be 6.
Now if we plot graph ( Bcoz I want to learn this concept by understanding graph )
$cg(n)$ graph goes below of $f(n)$ graph. I have taken following values for both functions :

f(n) : 3n+3   
n  f(n) 

1   6  
2   9  
3   12   
-2  -3 

for

g(n) = 3.5n   
n   g(n)  
1   3.5  
2   7  
3   10.5  
-2  -7  

If we plot graph by these values it doesn't bind $f(n)$ i.e. $3n+3$ above by the value of $g(n)$ i.e. $3.5\cdot n$
Can anyone explain me this concept by graph ?

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