Calvin is mixing colored gravel for the bottom of his fish tank. He mixes 12 pounds of blue gravel with 3 pounds of purple grave
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The general form of recursive definition for arithmetic sequence:
So, what we need to do is to find
and 
.
Having found these two values we can now define our recursive sequence:
So, what we need to do is to find
Having found these two values we can now define our recursive sequence: