Answers

2016-07-13T19:55:59+08:00
A1 is yung first term ng geometric sequence 
0
an=a1+(n-1)d
for arithmetic sequence yung formula na an=a1+(n-1)d
sorry..so,the formula rather is:
ang alam ko yung a1 is yung first term ng sequence. Like a1=2, a2=4, a3=8, a4=16,...
an=a1r Raised to n-1.