2a = 2
a = 1
3a+b = 9
b = 6
a+b+c= 15
c=8
maka suku ke 80 = n^2+ 6n + 8
= 80^2+6*80+8=6400+480+8=6888
Jawab:
Penjelasan dengan langkah-langkah:
a = 15
n = 80
b = 9
c = 2
a + (n-1)b + c/2 (n-1)(n-2)
= 15 + (80-1)9 + 2/2(80-1)(80-2)
= 15 + (79)9 + (79)(78)
= 15 + 711 +6162
=6888
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2a = 2
a = 1
3a+b = 9
b = 6
a+b+c= 15
c=8
maka suku ke 80 = n^2+ 6n + 8
= 80^2+6*80+8=6400+480+8=6888
Jawab:
U80 = 6312
Penjelasan dengan langkah-langkah:
a = 15
n = 80
b = 9
c = 2
a + (n-1)b + c/2 (n-1)(n-2)
= 15 + (80-1)9 + 2/2(80-1)(80-2)
= 15 + (79)9 + (79)(78)
= 15 + 711 +6162
=6888