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jika n = 2 maka U2 - U1 = 2(2)+3
U2- 15 = 7
U2 = 7+15=22
b=U2-U1
=22-15=7
Un=U1+(n-1)b
U50=15+49(7)
=15+ 343 = 358
U50-U2=358-22=336