Jumlah 20 pertama deret 3+7+11+15... sama dengan
a. 800
b. 810
c. 820
d. 840
e. 850
a. 800
b. 810
c. 820
d. 840
e. 850
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Verified answer
Mapel : MatematikaKelas : SMP
Materi : barisan n deret
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Dik : 3+7+11+15+....
Dit : S20=??
Jawab:
3+7+11+15+.....
a= 3
b = U2-U1
b = 7-3
b = 4
Rumus : Sn = n/2 (2a + (n-1).b)
S20 = ²⁰/₂ ( 2(3) + (20-1).4 )
S20 = 10 ( 6 + (19).4 )
S20 = 10 ( 6 + 76 )
S20 = 10 (82)
S20 = 820
820 (C)