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contoh deret hitung
pola 13,23,33,43,....,83
dit: 83 suku n berapa?
jawab:
a=13
b=23-13=10
Un=a+(n-1)b
83=13+(n-1)10
83=13+10n-10
83=10n+3
10n=80
n=80/10
n=8
bukti:
13,23,33,43,53,63,73,83,93