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U3=23
b=2-23:10-3=-21:7=-3
Un=a+(n-1)b
U3=a+(3-1)-3
23=a+(-6)
23=a-6
a=23+6
a=29
suku kelima=> U5=a+(n-1)b
U5=29+(5-1)-3
U5=29+(-12)
U5=17
jadi suku kelima=17