Hitunglah jumlah deret aritmatika berikut ini. a.1+4+7+10+......(20 suku) ditanyakan : jumlah 20 suk.... Question from @andipratama2004

October 2018 2 13 Report

Hitunglah jumlah deret aritmatika berikut ini.

a.1+4+7+10+......(20 suku)

ditanyakan : jumlah 20 suku pertama

Bloodychain U20 = a + 19b
U20 = 1 + 19 x 3
U20 = 1 + 57
U20 = 58

S20 = 20/2 x (1 + 58)
S20 = 10 x 59
S20 = 590

Maaf kalau salah

2 votes Thanks 2

Novanda47 U20 = 58
sedangkan sn = 590

0 votes Thanks 1

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