5 and 20 are the first two terms in a geometric sequence. What is the arithmetic difference between the 10th term and the 12th term? Choose the correct choice from the following choices.
A) 3*5^2  B) 5* 3^13 - 5 * 3^11  C) 75*4^10  D) 40 * 3^10  E) 3^12 - 3^10
Common ratio = 20/5= 
<gadget id="calculator">20/5</gadget>
<output>4</output>
4   12th term= 5*4^12   10th term = 5*4^10   5 * (4^12 - 4^10) = 5 * 4^10*(4^2 - 1)   = 5 * 4^10 * 15   = 75 * 4^10....   75*4^10
<result>C</result>
5 and 20 are the first two terms in a geometric sequence. What is the arithmetic difference between the 10th term and the 12th term?