Adding to find the sum if it exists

Question

Find the sum if it exists: 175+105+63+...

Answer 1

{ 175 ,105, 63, .......}

 

 

 105/175 = 0.6

 

63/ 105= 0.6

 

 This is a geometric series with a=175, r= 0.6

 

Sum =  175      = 437.5

            1 - 0.6