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u6= 32/3
b= 32/3-16
=16/3
a
u5=a+(n-1)b
16=a+(5-1)16/3
16=a+64/3
a=16-64/3
a= 48/3-64/3
a= -16/3
Sn=n/2(2a+(n-1)b
S5=5/2(2*-16/3+(5-1)*16/3
=5/2(-32/3+64/3)
=5/2(32/3)
=26 4/6
jumlah 5 suku pertama= 26 4/6