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There are 2 types of formula depending upon the given sequence. 1st is an=an+b or mas madali yung ganito yung format:
For example, 4,7,10,13
Ang pattern niya ay by 3.
So, 3 multiplied by n is equal to 3n or 3 is the value of a
go back to the orig. sequence .
orig. sequence= 4,7,10,13
3n sequence= 3,6,9,12
Therefore, an=3n+1
 Yung quadratic formula medyo mahaba so di ko mailalagay lahat but if you need help pa imessage mo nalang po ako dito. 
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