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b=5
an=a+(n-1)b
63=3+(n-1)5
63-3=5n-5
60+5=5n
65=5n
n=13
Sn=n/2 (a+an)
=13/2 (3+63)
=13/2(66)
=13x33
=429
jadi, jumlah deret di atas adalah 429