a=9
b=6
un=93
un=a+(n-1)b
93=9+(n-1)6
93=9+6n-6
93=6n-3
6n=96
n=16
sn=n/2 (2a+(n-1) b)
s16=16/2 (2*9+(16-1) 6)
s16=8 (18+15*6)
s16=8 (108)
s16=864
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a=9
b=6
un=93
un=a+(n-1)b
93=9+(n-1)6
93=9+6n-6
93=6n-3
6n=96
n=16
sn=n/2 (2a+(n-1) b)
s16=16/2 (2*9+(16-1) 6)
s16=8 (18+15*6)
s16=8 (108)
s16=864
semoga membantu