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U2=15
u3= 23
u4= 34
u5=48
selisih:
U2-U1= 15-10= 5
U3-U2= 23-15= 8
U4-U3 34-23 = 11
U5-U4= 48-34= 14
8-5=3
11-8= 3
14-11= 3
U=suku ke