Hi,

Arithmetic sequence

In General:   and 

{2, 4, 6, 8, ..., 70) d = 2  and  n = 35

finding the Sum of the first 35 Terms: 

14, 8, 2,...; n=9   d = -6

finding the Sum of the first 9 Terms:



Geometric sequence

In General:    and 

Find the sum of the geometric sequence 42, 7, 7/6, .... ,   and last term is the 9th Term

finding the Sum of the first 9 Terms: using  as  is so insignificant

-1, 11, -121, ...; n = 9 , r = -11 :

finding the Sum of the first 9 Terms: 

will Let You finish this one out 

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