5, 10, 15, 20, 25, …
=
+ (n – 1)d
= 5 + (n – 1)(5)
= 5 + 5n – 5
= 5n
=
+ (n – 1)d
= 5 + (50 – 1)(5)
= 5 + 245
= 250
=
(
+
)
=
(5 + 250)
= 25(255)
= 6,375
5, 10, 15, 20, 25, …
=
+ (n – 1)d
= 5 + (n – 1)(5)
= 5 + 5n – 5
= 5n
=
+ (n – 1)d
= 5 + (50 – 1)(5)
= 5 + 245
= 250
=
(
+
)
=
(5 + 250)
= 25(255)
= 6,375