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10 , 15 , 20 , 25 , 30 , 35 , . . . , un
+5
+5
+5
+5
+5
u1
u2
u3
u4
u5
u6
10 + 15 + 20 + 25 + 30 + 35 + . . . + un
+5
+5
+5
+5
+5
Sn =
100 , 50 , 25 , 12.5 , 6.25 , 3.125 , . . . , un
×
1
2
×
1
2
×
1
2
×
1
2
×
1
2
u1
u2
u3
u4
u5
u6
100 + 50 + 25 + 12.5 + 6.25 + 3.125 + . . . + un
×
1
2
×
1
2
×
1
2
×
1
2
×
1
2
Sn =
Arithmetic Sequence and Series
Geometric Sequence and Series