My arithmetic sequence : 4, 8, 12, 16, 20 (determine )
=
+ (
–
)(
)
=
+ (
–
) (
)
=
+
=
Finding the sum of 50 terms :
=
(
+
)
=
(
+
)
=
(
)
=
My arithmetic sequence : 4, 8, 12, 16, 20 (determine )
=
+ (
–
)(
)
=
+ (
–
) (
)
=
+
=
Finding the sum of 50 terms :
=
(
+
)
=
(
+
)
=
(
)
=
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