Question 736363: Is 12,40,68,96 sequence geometric or arthmetic? If possible what is the common ratio or difference
Answer by MathLover1(20849)   (Show Source):
You can put this solution on YOUR website! For  sequences, the common difference is  , and the first term  is often referred to simply as " ". Since you get the next term by adding the common difference, the value of  is just  . The third term is  . The fourth term is  . Following this pattern, the  term an will have the form
 .
For  sequences, the common ratio is  , and the first term is often referred to simply as "". Since you get the next term by multiplying by the common ratio, the value of is just  . The third term is  . The fourth term is  . Following this pattern, the term an will have the form
 .
in your case  , , , sequence is have the form
common difference is  and the greatest common divisor is 
first term is and if divided by , we get  that could be written as  starting with  and up
so, the recursive formula is:
and this is sequence
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