Answer:
501590018 steps
Step-by-step explanation:
To find this high numbered problem all you have to do is add the steps in total. You would add 273626256 and 227963762 to get 501590018
 
        
                    
             
        
        
        
We take 2 marbles from 20 marbles and the total ways is 20x19:2=190
But we need only 2 red marbles and the ways is 14x13:2=91
And finally we do the division 91:190=91/190 is the probability we need
        
             
        
        
        
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Slope-intercept form:
y=1/3x+11/3