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Un=24/10
n=5
a=12/10
Un=a+(n-1)b
24/10=12/10+4b
24/10-12/10=4b
12/10 dibagi 4 =b
0,3=b
Sn=n/2(a+un)
Sn=5/2(12/10+24/10)
sn= 5/2 . 36/10
Sn= 180/20
Sn= 9 meter