630
Use the Formula of the general term of an Arithmetic Sequence and the Formula of Arithmetic Series to solve the problem.
a1 = 3 d = 3 n = 20 an = 60
an = a1 + (n - 1) d Sn = n (a1 + an)
2
a20 = 3 + (20 - 1) 3 S20 = 20 (3 + 60)
a20 = 3 + (19) 3 2
a20 = 3 + 57 S20 = 10 (63)
a20 = 60 S20 = 630
correct me if i'm wrong.
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630
Use the Formula of the general term of an Arithmetic Sequence and the Formula of Arithmetic Series to solve the problem.
a1 = 3 d = 3 n = 20 an = 60
an = a1 + (n - 1) d Sn = n (a1 + an)
2
a20 = 3 + (20 - 1) 3 S20 = 20 (3 + 60)
a20 = 3 + (19) 3 2
a20 = 3 + 57 S20 = 10 (63)
a20 = 60 S20 = 630
correct me if i'm wrong.